[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).
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