Alexey Samsonov 8bc0067071 Fix UBSan report in StringMap implementation.
Use offsetof() instead of a member access within null pointer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223402 91177308-0d34-0410-b5e6-96231b3b80d8
2014-12-04 22:45:31 +00:00
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