[Object][NFC] Add extern template declarations needed by llvm-objdump (#109156)

These symbols are implicitly imported from the LLVM shared library by
llvm-objdump on ELF like platforms, but for windows they need to be
explicitly exported when LLVM is built as shared library.
I also add visibility macros for XCOFFObjectFile::getExceptionEntries
that can't automatically be added by clang tooling since it doesn't
store the source locations for explicit function template
instantiations.

1 files changed, 5 insertions, 4 deletions

diff --git a/llvm/lib/Object/ELF.cpp b/llvm/lib/Object/ELF.cpp
index c66736f..9a9e762 100644
--- a/llvm/lib/Object/ELF.cpp
+++ b/llvm/lib/Object/ELF.cpp
@@ -9,6 +9,7 @@
 #include "llvm/Object/ELF.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/BinaryFormat/ELF.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/DataExtractor.h"
 
 using namespace llvm;
@@ -980,7 +981,7 @@ ELFFile<ELFT>::getSectionAndRelocations(
   return SecToRelocMap;
 }
 
-template class llvm::object::ELFFile<ELF32LE>;
-template class llvm::object::ELFFile<ELF32BE>;
-template class llvm::object::ELFFile<ELF64LE>;
-template class llvm::object::ELFFile<ELF64BE>;
+template class LLVM_EXPORT_TEMPLATE llvm::object::ELFFile<ELF32LE>;
+template class LLVM_EXPORT_TEMPLATE llvm::object::ELFFile<ELF32BE>;
+template class LLVM_EXPORT_TEMPLATE llvm::object::ELFFile<ELF64LE>;
+template class LLVM_EXPORT_TEMPLATE llvm::object::ELFFile<ELF64BE>;