[DirectX] Denote `dx.resource.getpointer` with `IntrInaccessibleMemOnly` and `IntrReadMem` (#193593) `IntrConvergent` was originally added to `dx.resource.getpointer` to prevent optimization passes (`SimplifyCFG`, `GVN`) from sinking the intrinsic out of control flow branches, which would create phi nodes on the returned pointer. Using `IntrInaccessibleMemOnly` and `IntrReadMem` semantics still prevent passes from merging or sinking identical calls across branches. However, this allows the call to be moved within a single control flow path. Updates relevant tests and adds a new test to demonstrate a now legal potential optimization. This was discovered when https://github.com/llvm/llvm-project/pull/188792 caused the following failure: https://github.com/llvm/llvm-project/actions/runs/24577221310/job/71865579618. When emitting convergence control tokens, each resource access is then a user of the convergence control tokens, which makes it's use more unnecessarily restrictive for optimizations and in this case would prevent a loop unroll from taking place. Assisted by: Claude Opus 4.6
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