LTO: Hash the parts of the LTO configuration that affect code generation.

Most importantly, we need to hash the relocation model, otherwise we can
end up trying to link non-PIC object files into PIEs or DSOs.

Differential Revision: https://reviews.llvm.org/D27556

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289024 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed