[PATCH] Remove support for runtime multithreading

[Zachary Turner]

Hi dblaikie, rnk,

This is a resubmit of r210600 (Differential Revision D4076).   This probably only needs a quick glance since the previous change was already reviewed, however this change differs from the previous submission in 3 important ways:

1) Conversions from sys::Mutex to std::[recursive_]mutex are removed, to reduce the scope of the changes.  Those will be submitted later as a separate changelist.

2) Some compilation errors were fixed in unittests that only occur on linux.

3) An instance of undefined behavior was fixed that was leading to crashes on FreeBSD.  See the comment in ErrorHandling.cpp.

http://reviews.llvm.org/D4139

Files:
  include/llvm-c/Core.h
  include/llvm/Support/ErrorHandling.h
  include/llvm/Support/ManagedStatic.h
  include/llvm/Support/Mutex.h
  include/llvm/Support/Threading.h
  lib/IR/Core.cpp
  lib/Support/ErrorHandling.cpp
  lib/Support/ManagedStatic.cpp
  lib/Support/Threading.cpp
  lib/Support/Timer.cpp
  unittests/Support/ManagedStatic.cpp
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