[PATCH] Replace ExecutionEngine's sys::Mutex with std::recursive_mutex.

[Zachary Turner]

Hi dblaikie, rnk, chandlerc,

This is the beginning of the effort to remove sys::Mutex

Nothing complicated here, and this will be probably the most complicated of the mutex replacements given that a pointer to a mutex is returned.  I'll put this one up for review, and assuming there are no glaring issues, will move forward with the rest of the conversions without review.

http://reviews.llvm.org/D4166

Files:
  include/llvm/ExecutionEngine/ExecutionEngine.h
  include/llvm/IR/ValueMap.h
  lib/ExecutionEngine/ExecutionEngine.cpp
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