[Clang][OpenMP] Bug in Support for Code Generation of loop bind clause : Before Mapping directive needs to check the parent region.

[SunilKuravinakop]

In https://reviews.llvm.org/D144634 : Support for Code Generation of loop bind clause before mapping a directive to the new directive there is a need to check if the parent directive/region is proper for the new mapped directive. e.g.

pragma omp parallel for

for () {

pragma omp loop bind(parallel)

for() {} }.

After mapping omp loop bind(parallel) to omp for the above example becomes:

pragma omp parallel for

for () {

pragma omp for

for() {} }. However, it is illegal to have a for region within another for region. Rules in the OpenMP Spec “Nesting of Regions” need to be taken into account before mapping.

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