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a4739d6687
We were hashing the string pointer, not the string, so two instructions could be identical (isIdenticalTo), but have different hash codes. This showed up as a very rare, non-deterministic assertion failure rehashing a DenseMap constructed by MachineOutliner. So there's no "real" testcase, just a unittest which checks that the hash function behaves correctly. I'm a little scared fixing this is going to cause a regression in outlining or MachineCSE, but hopefully we won't run into any issues. Differential Revision: https://reviews.llvm.org/D61975 llvm-svn: 362281
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