[libLTO][AIX] Respect `-f[no]-integrated-as` on AIX

`libLTO` currently ignores the `-f[no-]integrated-as` flags. This patch teaches `libLTO` to respect them on AIX.

The implementation consists of two parts:

  # Migrate `llc`'s `-no-integrated-as` option to a codegen option so that the option is available to `libLTO`/`lld`/`gold`.
  # Teach `clang` to pass `-no-integrated-as` accordingly to `libLTO` depending on the `-f[no-]integrated-as` flags.

On platforms other than AIX, the `-f[no-]integrated-as` flags are ignored.

Reviewed By: MaskRay, steven_wu

Differential Revision: https://reviews.llvm.org/D152924

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/CommandFlags.cpp b/llvm/lib/CodeGen/CommandFlags.cpp
index 59b5decb..c34a52a 100644
--- a/llvm/lib/CodeGen/CommandFlags.cpp
+++ b/llvm/lib/CodeGen/CommandFlags.cpp
@@ -81,6 +81,7 @@ CGOPT(bool, StackSymbolOrdering)
 CGOPT(bool, StackRealign)
 CGOPT(std::string, TrapFuncName)
 CGOPT(bool, UseCtors)
+CGOPT(bool, DisableIntegratedAS)
 CGOPT(bool, RelaxELFRelocations)
 CGOPT_EXP(bool, DataSections)
 CGOPT_EXP(bool, FunctionSections)
@@ -487,6 +488,11 @@ codegen::RegisterCodeGenFlags::RegisterCodeGenFlags() {
       cl::init(false));
   CGBINDOPT(XCOFFReadOnlyPointers);
 
+  static cl::opt<bool> DisableIntegratedAS(
+      "no-integrated-as", cl::desc("Disable integrated assembler"),
+      cl::init(false));
+  CGBINDOPT(DisableIntegratedAS);
+
 #undef CGBINDOPT
 
   mc::RegisterMCTargetOptionsFlags();
@@ -540,6 +546,7 @@ codegen::InitTargetOptionsFromCodeGenFlags(const Triple &TheTriple) {
   Options.GuaranteedTailCallOpt = getEnableGuaranteedTailCallOpt();
   Options.StackSymbolOrdering = getStackSymbolOrdering();
   Options.UseInitArray = !getUseCtors();
+  Options.DisableIntegratedAS = getDisableIntegratedAS();
   Options.RelaxELFRelocations = getRelaxELFRelocations();
   Options.DataSections =
       getExplicitDataSections().value_or(TheTriple.hasDefaultDataSections());