Merging r275926:

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r275926 | kkwli0 | 2016-07-18 15:49:16 -0700 (Mon, 18 Jul 2016) | 25 lines

[OpenMP] Fix incorrect diagnostics in map clause

Having the following code pattern will result in incorrect diagnostic

int main() {
  int arr[10];
#pragma omp target data map(arr[:])
#pragma omp target map(arr)
  {}
}

t.cpp:4:24: error: original storage of expression in data environment is shared
      but data environment do not fully contain mapped expression storage
#pragma omp target map(arr)
                       ^~~
t.cpp:3:29: note: used here
#pragma omp target data map(arr[:])
                            ^~~~~~
1 error generated.

Patch by David S.

Differential Revision: https://reviews.llvm.org/D22075

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llvm-svn: 287816