[PATCH] [OPENMP] Loop collapsing and initial codegen for 'omp simd' directive

[Alexander Musman]

Hi doug.gregor, rsmith, hfinkel, rjmccall, ABataev, fraggamuffin, ejstotzer, cbergstrom, kkwli0, schandra,

This patch implements collapsing of the loops (in particular, in presense of clause 'collapse'). It calculates number of iterations N and expressions nesessary to calculate the nested loops counters values based on new iteration variable (that goes from 0 to N-1) in Sema. It also adds Codegen for 'omp simd', which uses (and tests) this feature.

http://reviews.llvm.org/D5184

Files:
  include/clang/AST/Stmt.h
  include/clang/AST/StmtOpenMP.h
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/AST/Stmt.cpp
  lib/CodeGen/CGStmtOpenMP.cpp
  lib/CodeGen/CodeGenFunction.h
  lib/Sema/SemaOpenMP.cpp
  lib/Serialization/ASTReaderStmt.cpp
  lib/Serialization/ASTWriterStmt.cpp
  test/OpenMP/for_loop_messages.cpp
  test/OpenMP/parallel_for_loop_messages.cpp
  test/OpenMP/simd_codegen.cpp
  test/OpenMP/simd_loop_messages.cpp
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