[llvm] [SPIRV][HLSL] Implement CBuffer access lowering pass (PR #159136)

[Nathan Gauër via llvm-commits]

================
@@ -57,8 +58,9 @@ add_llvm_target(SPIRVCodeGen
   Core
   Demangle
   GlobalISel
-  SPIRVAnalysis
+  FrontendHLSL
----------------
Keenuts wrote:

What if clang is built with SPIR-V support but no HLSL support? Does this still work?

https://github.com/llvm/llvm-project/pull/159136