[mlir] Flip Async/GPU/OpenACC/OpenMP to use Both accessors

[mlir] Flip Async/GPU/OpenACC/OpenMP to use Both accessors

This allows for incrementally updating the old API usages without
needing to update everything at once. These will be left on Both
for a little bit and then flipped to prefixed when all APIs have been
updated.

Differential Revision: https://reviews.llvm.org/D134386