Rui Ueyama 089cd2cb50 Revert r301487: Replace HashString algorithm with xxHash64
This reverts commit r301487 to make buildbots green.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301491 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-26 23:15:10 +00:00
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