[PATCH] [OPENMP] Codegen for "#pragma omp atomic write"

[Alexey Bataev]

Hi rjmccall, fraggamuffin, ejstotzer,

For global reg lvalue - use regular store through global register.
For simple lvalue - use simple atomic store.
For bitfields, vector element, extended vector elements - the original value of the whole storage (for vector elements) or of some aligned value (for bitfields) is atomically read, the part of this value for the given lvalue is modified and then use atomic compare-and-exchange operation to try to atomically write modified value (if it was not modified).

http://reviews.llvm.org/D7369

Files:
  lib/CodeGen/CGAtomic.cpp
  lib/CodeGen/CGStmtOpenMP.cpp
  lib/Sema/SemaOpenMP.cpp
  test/OpenMP/atomic_read_codegen.c
  test/OpenMP/atomic_write_codegen.c

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