[PATCH] D94487: [LTO] Use lto::backend for code generation (WIP).

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
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This patch updates LTOCodeGenerator to use the utilities provided by
LTOBackend to run middle-end optimizations and backend code generation.

This is a first step towards unifying the code used by libLTO's C API
and the newer, C++ interface (see PR41541).

The immediate motivation is to allow using the new pass manager when
doing LTO using libLTO's C API, which is used on Darwin, among others.

This is still WIP, as some of the error handling still needs to be
updated/improved, but I wanted to share it early, to get some more
high-level feedback.

Also, some options are not yet supported via lto::Config.

With the changes, there are no codegen/stats differences when building
MultiSource/SPEC2000/SPEC2006 on X86 with LTO, compared to without the
patch.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D94487

Files:
  llvm/include/llvm/LTO/LTO.h
  llvm/lib/LTO/Caching.cpp
  llvm/lib/LTO/LTOCodeGenerator.cpp
  llvm/test/LTO/X86/disable-verify.ll
  llvm/test/tools/lto/print-stats.ll

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