[PATCH] D152924: [libLTO][AIX] Respect `-f[no]-integrated-as`

[Qiongsi Wu via Phabricator via cfe-commits]

qiongsiwu1 created this revision.
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`libLTO` currently ignores the `-f[no-]integrated-as` flags. This patch teaches `libLTO` to respect them.

The implementation consists of two parts:

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

`libLTO` cannot use system assemblers on platforms other than AIX. As part of the option processing, a warning is implemented if `-fno-integrated-as` is used for LTO on platforms other than AIX.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D152924

Files:
  clang/include/clang/Basic/DiagnosticDriverKinds.td
  clang/lib/Driver/ToolChains/CommonArgs.cpp
  clang/test/Driver/lto-aix.c
  clang/test/Driver/lto.c
  llvm/include/llvm/CodeGen/CommandFlags.h
  llvm/lib/CodeGen/CommandFlags.cpp
  llvm/lib/LTO/LTOCodeGenerator.cpp
  llvm/test/tools/llvm-lto/aix-sys-as.ll
  llvm/test/tools/llvm-lto/aix.ll
  llvm/tools/llc/llc.cpp

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