[Frontend] Add leaf constructs and association to OpenMP/ACC directives (#83625) Add members "leafConstructs" and "association" to .td describing OpenMP/ACC directives. The naming follows the terminology used in the OpenMP standard: a "leaf" construct is a construct that is itself not a composition or a combination of other constructs, and "association" is the source language construct to which the directive applies (e.g. loop, block, etc.) The tblgen-generated output then contains two additional functions - getLeafConstructs(D), and - getDirectiveAssociation(D) plus "enum class Association", all in namespaces "llvm::omp" and "llvm::acc". Note: getLeafConstructs returns an empty sequence for a construct that is itself a leaf construct. Use the new functions to simplify a few OpenMP-related functions in clang.
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