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69e4dd1b12
lto_codegen_compile_optimized. Also add lto_api_version. Before this commit, we can only dump the optimized bitcode after running lto_codegen_compile, but it includes some impacts of running codegen passes, one example is StackProtector pass. We will get assertion failure when running llc on the optimized bitcode, because StackProtector is effectively run twice. After splitting lto_codegen_compile, the linker can choose to dump the bitcode before running lto_codegen_compile_optimized. lto_api_version is added so ld64 can check for runtime-availability of the new API. rdar://19565500 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228000 91177308-0d34-0410-b5e6-96231b3b80d8
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