Apply constexpr to the mutex constructor.  As a conforming extension, apply constexpr to the condition_variable constructor.  These are important because it enables the compiler to construct these types at compile time, even though the object will be non-const.  Since they are constructed at compile time, there is no chance of a data race before they are constructed.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@159901 91177308-0d34-0410-b5e6-96231b3b80d8
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