Ensure we stop at BC emission when mixing amdgcnspirv and concrete, otherwise the toolchain gets confused.

Author: AlexVlx

clang/lib/Driver/Driver.cpp

@@ -3750,9 +3750,12 @@ class OffloadingActionBuilder final {
             // compiler phases, including backend and assemble phases.
             ActionList AL;
             Action *BackendAction = nullptr;
-            if (ToolChains.front()->getTriple().isSPIRV()) {
+            if (ToolChains.front()->getTriple().isSPIRV() ||
+                (ToolChains.front()->getTriple().isAMDGCN() &&
+                 GpuArchList[I] == StringRef("amdgcnspirv"))) {
               // Emit LLVM bitcode for SPIR-V targets. SPIR-V device tool chain
-              // (HIPSPVToolChain) runs post-link LLVM IR passes.
+              // (HIPSPVToolChain or HIPAMDToolChain) runs post-link LLVM IR
+              // passes.
               types::ID Output = Args.hasArg(options::OPT_S)
                                      ? types::TY_LLVM_IR
                                      : types::TY_LLVM_BC;