[OpenMP] Patch for Support to loop bind clause : Checking Parent Region (#76938)

Changes uploaded to the phabricator on Dec 16th are lost because the
phabricator is down. Hence re-uploading it to the github.com.

  Changes to be committed:
 	modified:   clang/include/clang/Sema/Sema.h
 	modified:   clang/lib/Sema/SemaOpenMP.cpp
 	modified:   clang/test/OpenMP/generic_loop_ast_print.cpp
 	modified:   clang/test/OpenMP/loop_bind_messages.cpp
 	modified:   clang/test/PCH/pragma-loop.cpp

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Co-authored-by: Sunil Kuravinakop