[Resource] Add tests for resource access in control flow#1374
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This pr adds test coverage for resource access patterns that are potential optimizations in modern llvm. These optimizations can create illegal looking resource accesses in clang. DXC does not represent resource access through a regular store/load and will perform any such optimizations.
Optimizations considered:
GVNsink of load/storeSimplifyCFGsink of load/storeInstCombinephi sink of loadLICMloop invariant sinkThese are considered for [non-]dynamic resources and resources that result in a gep of a struct member.
Assisted by: Claude Opus 4.8