[PATCH] [OPENMP] Initial codegen for 'omp task' directive.

[Alexey Bataev]

Hi rjmccall, fraggamuffin, ejstotzer,

The task region is emmitted in several steps:
1. Emit a call to kmp_task_t *__kmpc_omp_task_alloc(ident_t *, kmp_int32 gtid, kmp_int32 flags, size_t sizeof_kmp_task_t, size_t sizeof_shareds,  kmp_routine_entry_t *task_entry). Here task_entry is a pointer to the function:

```
kmp_int32 .omp_task_entry.(kmp_int32 gtid, kmp_task_t *tt) {
  TaskFunction(gtid, tt->part_id, tt->shareds);
  return 0;
}
```
2. Copy a list of shared variables to field shareds of the resulting structure kmp_task_t returned by the previous call (if any).
3. Copy a pointer to destructions function to field destructions of the resulting structure kmp_task_t.
4. Emit a call to kmp_int32 __kmpc_omp_task(ident_t *, kmp_int32 gtid, kmp_task_t *new_task), where new_task is a resulting structure from previous items.

http://reviews.llvm.org/D7560

Files:
  lib/CodeGen/CGOpenMPRuntime.cpp
  lib/CodeGen/CGOpenMPRuntime.h
  lib/CodeGen/CGStmtOpenMP.cpp
  lib/Sema/SemaOpenMP.cpp
  test/OpenMP/task_codegen.cpp

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