[OpenMP][OMPIRBuilder] Migrate emitOffloadingArraysArgument from clang

This patch moves the emitOffloadingArraysArgument function and
supporting data structures to OpenMPIRBuilder. This will later be used
in flang as well. The TargetDataInfo class was split up into generic
information and clang-specific data, which remain in clang. Further
migration will be done in in the future.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D134662