[RS4GC] Strip off invariant.start because memory locations arent invariant
Summary:
Invariant.start on memory locations has the property that the memory
location is unchanging. However, this is not true in the face of
rewriting statepoints for GC.
Teach RS4GC about removing invariant.start so that optimizations after
RS4GC does not incorrect sink a load from the memory location past a
statepoint.
Added test showcasing the issue.
Reviewers: reames, apilipenko, dneilson
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D39388
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317215
91177308-0d34-0410-b5e6-
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