[SPIRV][HLSL] Implement CBuffer access lowering pass (#159136) This patch introduces a new pass, SPIRVCBufferAccess, which is responsible for translating accesses to HLSL constant buffer (cbuffer) global variables into accesses to the proper SPIR-V resource. The pass operates by: 1. Identifying all cbuffers via the `!hlsl.cbs` metadata. 2. Replacing all uses of cbuffer member global variables with `llvm.spv.resource.getpointer` intrinsics. 3. Cleaning up the original global variables and metadata. This approach allows subsequent passes, like SPIRVEmitIntrinsics, to correctly fold GEPs into a single OpAccessChain instruction. The patch also includes a comprehensive set of lit tests to cover various scenarios: - Basic cbuffer access direct load and GEPs. - Unused and partially unused cbuffers. This implements the SPIR-V version of https://github.com/llvm/wg-hlsl/blob/main/proposals/0016-constant-buffers.md#lowering-to-buffer-load-intrinsics.
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