[MLIR][OpenMP] Alterations to LLVM-IR lowering of OpenMP Dialect due to Bounds...

[MLIR][OpenMP] Alterations to LLVM-IR lowering of OpenMP Dialect due to Bounds and MapEntry operations

This patch adjusts the lower to LLVM-IR inside of
OpenMPToLLVMIRTranslation to faciliate the changes made
to Target related operations to add the new Map related
operations. It also includes adjustments to tests to support
these changes, primarily modifying the MLIR as opposed to
the LLVM-IR, the LLVM-IR should be identical after this patch.

Depends on D158735

Reviewers: kiranchandramohan, TIFitis, razvanlupusoru

Differential Revision: https://reviews.llvm.org/D158737