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feature: Add pseudo-GPU device compilation harness for pass verification - #550
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Drive the real HIP device pipeline (clang -x hip targeting amdgcn) on machines without ROCm or a GPU. A minimal hip/hip_runtime.h stub plus -nogpuinc -nogpulib --offload-device-only lets unmodified GPU tests compile with ProteusPass loaded, so lambda kernel-arg and clobbering analysis decisions are verifiable ahead of time from the PROTEUS_DEBUG_OUTPUT pass trace. Verified against Homebrew LLVM 19 and 22: lambda_clobber_shapes reproduces all 12 expected decisions. Known quirk handled by the driver: upstream clang registers -fpass-plugin pipeline callbacks twice for HIP device compiles (ROCm clang does not), so the second ProteusPass run dies on the duplicate _jit_bitcode global after analysis completes; the script treats exactly that fatal as benign. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Drive the real HIP device pipeline (clang -x hip targeting amdgcn) on machines without ROCm or a GPU. A minimal hip/hip_runtime.h stub plus -nogpuinc -nogpulib --offload-device-only lets unmodified GPU tests compile with ProteusPass loaded, so lambda kernel-arg and clobbering analysis decisions are verifiable ahead of time from the PROTEUS_DEBUG_OUTPUT pass trace. Verified against Homebrew LLVM 19 and 22: lambda_clobber_shapes reproduces all 12 expected decisions.
Known quirk handled by the driver: upstream clang registers -fpass-plugin pipeline callbacks twice for HIP device compiles (ROCm clang does not), so the second ProteusPass run dies on the duplicate _jit_bitcode global after analysis completes; the script treats exactly that fatal as benign.