[PATCH] [OPENMP] CodeGen for "omp atomic read [seq_cst]" directive.

[Alexey Bataev]

Fixed codegen for atomic load for bitfield, vector element and ext vector element lvalues: __atomic_load() builtin is used for loading of the whole part of lvalue and then regular processing of bitfield or vector element is applied to this loaded value. Lvalues for global registers are still loaded using global lock.
The same scheme is supposed to be used for all other atomic operations


http://reviews.llvm.org/D6431

Files:
  lib/CodeGen/CGAtomic.cpp
  lib/CodeGen/CGOpenMPRuntime.cpp
  lib/CodeGen/CGOpenMPRuntime.h
  lib/CodeGen/CGStmtOpenMP.cpp
  test/OpenMP/atomic_read_codegen.c

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