Revert "[AIX] Support of Big archive (read)"

This appears to be causing the following build failures on green
dragon during stage2 builds on macOS:

 /System/Volumes/Data/jenkins/workspace/apple-clang-stage2-configure-RA_osceola/clang.roots/BuildRecords/clang-9999.99_install/Objects/obj-llvm/./bin/clang++ -fno-stack-protector -fno-common -Wno-profile-instr-unprofiled -Wno-unknown-warning-option -Werror=unguarded-availability-new -fPIC -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -fmodules -fmodules-cache-path=/System/Volumes/Data/jenkins/workspace/apple-clang-stage2-configure-RA_osceola/clang.roots/BuildRecords/clang-9999.99_install/Objects/obj-llvm/tools/clang/stage2-bins/module.cache -fcxx-modules -Xclang -fmodules-local-submodule-visibility -gmodules -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-class-memaccess -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -fdiagnostics-color -O2 -gline-tables-only -DNDEBUG -arch x86_64 -arch arm64 -arch arm64e -isysroot /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk -mmacosx-version-min=10.10 -Wl,-search_paths_first -Wl,-headerpad_max_install_names -Wl,-dead_strip tools/llvm-cov/CMakeFiles/llvm-cov.dir/llvm-cov.cpp.o tools/llvm-cov/CMakeFiles/llvm-cov.dir/gcov.cpp.o tools/llvm-cov/CMakeFiles/llvm-cov.dir/CodeCoverage.cpp.o tools/llvm-cov/CMakeFiles/llvm-cov.dir/CoverageExporterJson.cpp.o tools/llvm-cov/CMakeFiles/llvm-cov.dir/CoverageExporterLcov.cpp.o tools/llvm-cov/CMakeFiles/llvm-cov.dir/CoverageFilters.cpp.o tools/llvm-cov/CMakeFiles/llvm-cov.dir/CoverageReport.cpp.o tools/llvm-cov/CMakeFiles/llvm-cov.dir/CoverageSummaryInfo.cpp.o tools/llvm-cov/CMakeFiles/llvm-cov.dir/SourceCoverageView.cpp.o tools/llvm-cov/CMakeFiles/llvm-cov.dir/SourceCoverageViewHTML.cpp.o tools/llvm-cov/CMakeFiles/llvm-cov.dir/SourceCoverageViewText.cpp.o tools/llvm-cov/CMakeFiles/llvm-cov.dir/TestingSupport.cpp.o -o bin/llvm-cov  -Wl,-rpath,@loader_path/../lib  lib/libLLVMCore.a  lib/libLLVMSupport.a  lib/libLLVMObject.a  lib/libLLVMCoverage.a  lib/libLLVMProfileData.a  lib/libLLVMDebugInfoDWARF.a  lib/libLLVMObject.a  lib/libLLVMBitReader.a  lib/libLLVMCore.a  lib/libLLVMRemarks.a  lib/libLLVMBitstreamReader.a  lib/libLLVMMCParser.a  lib/libLLVMTextAPI.a  lib/libLLVMMC.a  lib/libLLVMBinaryFormat.a  lib/libLLVMDebugInfoCodeView.a  lib/libLLVMSupport.a  -lm  /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk/usr/lib/libz.tbd  /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk/usr/lib/libcurses.tbd  lib/libLLVMDemangle.a && cd /System/Volumes/Data/jenkins/workspace/apple-clang-stage2-configure-RA_osceola/clang.roots/BuildRecords/clang-9999.99_install/Objects/obj-llvm/tools/clang/stage2-bins/tools/llvm-cov && xcrun dsymutil -o=llvm-cov.dSYM /System/Volumes/Data/jenkins/workspace/apple-clang-stage2-configure-RA_osceola/clang.roots/BuildRecords/clang-9999.99_install/Objects/obj-llvm/tools/clang/stage2-bins/bin/llvm-cov
Undefined symbols for architecture x86_64:
  "llvm::object::CommonArchiveMemberHeader<llvm::object::BigArMemHdrType>::getRawAccessMode() const", referenced from:
      vtable for llvm::object::BigArchiveMemberHeader in libLLVMObject.a(Archive.cpp.o)
  "llvm::object::CommonArchiveMemberHeader<llvm::object::BigArMemHdrType>::getRawUID() const", referenced from:
      vtable for llvm::object::BigArchiveMemberHeader in libLLVMObject.a(Archive.cpp.o)
  "llvm::object::CommonArchiveMemberHeader<llvm::object::BigArMemHdrType>::getRawGID() const", referenced from:
      vtable for llvm::object::BigArchiveMemberHeader in libLLVMObject.a(Archive.cpp.o)
  "llvm::object::CommonArchiveMemberHeader<llvm::object::UnixArMemHdrType>::getRawAccessMode() const", referenced from:
      vtable for llvm::object::ArchiveMemberHeader in libLLVMObject.a(Archive.cpp.o)
  "llvm::object::CommonArchiveMemberHeader<llvm::object::UnixArMemHdrType>::getRawLastModified() const", referenced from:
      vtable for llvm::object::ArchiveMemberHeader in libLLVMObject.a(Archive.cpp.o)
  "llvm::object::CommonArchiveMemberHeader<llvm::object::BigArMemHdrType>::getRawLastModified() const", referenced from:
      vtable for llvm::object::BigArchiveMemberHeader in libLLVMObject.a(Archive.cpp.o)
  "llvm::object::CommonArchiveMemberHeader<llvm::object::BigArMemHdrType>::getOffset() const", referenced from:
      vtable for llvm::object::BigArchiveMemberHeader in libLLVMObject.a(Archive.cpp.o)
  "llvm::object::CommonArchiveMemberHeader<llvm::object::UnixArMemHdrType>::getRawUID() const", referenced from:
      vtable for llvm::object::ArchiveMemberHeader in libLLVMObject.a(Archive.cpp.o)
  "llvm::object::CommonArchiveMemberHeader<llvm::object::UnixArMemHdrType>::getRawGID() const", referenced from:
      vtable for llvm::object::ArchiveMemberHeader in libLLVMObject.a(Archive.cpp.o)
  "llvm::object::CommonArchiveMemberHeader<llvm::object::UnixArMemHdrType>::getOffset() const", referenced from:
      vtable for llvm::object::ArchiveMemberHeader in libLLVMObject.a(Archive.cpp.o)
ld: symbol(s) not found for architecture x86_64

https://smooshbase.apple.com/ci/job/apple-clang-stage2-configure-RA_osceola/30276/console

1 files changed, 0 insertions, 2 deletions

diff --git a/llvm/lib/Object/ArchiveWriter.cpp b/llvm/lib/Object/ArchiveWriter.cpp
index 053b3da..da8bcec 100644
--- a/llvm/lib/Object/ArchiveWriter.cpp
+++ b/llvm/lib/Object/ArchiveWriter.cpp
@@ -137,7 +137,6 @@ static bool isBSDLike(object::Archive::Kind Kind) {
   case object::Archive::K_DARWIN:
   case object::Archive::K_DARWIN64:
     return true;
-  case object::Archive::K_AIXBIG:
   case object::Archive::K_COFF:
     break;
   }
@@ -200,7 +199,6 @@ static bool is64BitKind(object::Archive::Kind Kind) {
   case object::Archive::K_BSD:
   case object::Archive::K_DARWIN:
   case object::Archive::K_COFF:
-  case object::Archive::K_AIXBIG:
     return false;
   case object::Archive::K_DARWIN64:
   case object::Archive::K_GNU64: