pcc requested changes to this revision.
pcc added a comment.
This revision now requires changes to proceed.

The reason why LTO unit is always enabled is so that you can link translation 
units compiled with `-fsanitize=cfi` and/or `-fwhole-program-vtables` against 
translation units compiled without CFI/WPD. With this change we will see 
miscompiles in the translation units compiled with CFI/WPD if they use vtables 
in the translation units compiled without CFI/WPD. If we really need this 
option I think it should be an opt out.


Repository:
  rC Clang

https://reviews.llvm.org/D53524



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