[OpenMP] Use IsHostPtr where needed for targetDataBegin
As discussed in D105990, without this patch, `targetDataBegin`
determines whether to transfer data (as opposed to assuming it's in
shared memory) using the condition `!UseUSM || HasCloseModifier`.
However, this condition is broken if use of discrete memory was forced
by `omp_target_associate_ptr`. This patch extends
`unified_shared_memory/associate_ptr.c` to reveal this case, and it
fixes it using `!IsHostPtr` in `DeviceTy::getTargetPointer` to replace
this condition.
Reviewed By: grokos
Differential Revision: https://reviews.llvm.org/D107927
GitOrigin-RevId: d11bab0b73ec485f0b1e8dc38af0be72fcda1e34
4 files changed
