[openmp] Add addrspacecast to getOrCreateIdent

Fixes 51982. Adds a missing CreatePointerCast and allocates a global in
the correct address space.

Test case derived from https://github.com/ROCm-Developer-Tools/aomp/\
blob/aomp-dev/test/smoke/nest_call_par2/nest_call_par2.c by deleting
parts while checking the assertion failure still occurred.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D110556