Zachary Turner 84fea7720c Expose ValueMap's mutex type as a typedef instead of a sys::Mutex.
This enables static polymorphism of the mutex type, which is
necessary in order to replace the standard mutex implementation
with a different type.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211080 91177308-0d34-0410-b5e6-96231b3b80d8
2014-06-17 00:17:38 +00:00
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