llvm-project

ae402a32 - [Clang][HLSL] Start emitting structured GEP instruction (#177332)

[Clang][HLSL] Start emitting structured GEP instruction (#177332) StructuredGEP is a new LLVM intrinsic which will allow to emit proper logical SPIR-V or DXIL. To properly stage this change going across FE, BE and optimizations, this commits adds a new flag: - `-fexperimental-emit-sgep` When used, this flag will allow compatible frontends to emit the new instructions. This will also allow us to migrate tests bit by bit, adding the flag to each migrated test as we make progress on the implementation. Once the frontend migration complete, the flag will remain, and work on the backend will start. Compatible backends like SPIR-V will first allow both instructions, but then, depending on a target bit similar to `requiresStructuredCFG`, will declare that they require the SGEP instruction and will start enforcing it. Once the whole chain completed, the flag will be defaulted to true and removed, finishing the migration.