[mlir][OpenMP] allow cancellation to not be directly nested (#134084)

omp.cancel and omp.cancellationpoint contain an attribute describing the
type of parent construct which should be cancelled. e.g.
```
!$omp cancel do
```
Must be inside of a wsloop. Previously the verifer required the
immediate parent to be this operation. This is not quite right because
something like the following is valid:
```
!$omp parallel do
do i = 1, N
  if (cond) then
    !$omp cancel do
  endif
enddo
```

This patch relaxes the verifier to only require that some parent
operation matches (not necessarily the immediate parent).

0 files changed, 0 insertions, 0 deletions