[clang][Driver] SPIRVAMDToolChain must not require device libs. (#171815)

Prior to these changes, the SPIRVAMDToolChain was looking for device libs and failing. This is fixed by not looking for device libs (for SPIR-V). The device libs are never linked for SPIR-V.

Author: mgcarrasco

clang/lib/Driver/ToolChains/AMDGPU.cpp

@@ -967,6 +967,10 @@ void ROCMToolChain::addClangTargetOptions(
                           true))
     return;
 
+  // For SPIR-V (SPIRVAMDToolChain) we must not link any device libraries so we
+  // skip it.
+  if (this->getEffectiveTriple().isSPIRV())
+    return;
   // Get the device name and canonicalize it
   const StringRef GpuArch = getGPUArch(DriverArgs);
   auto Kind = llvm::AMDGPU::parseArchAMDGCN(GpuArch);

clang/test/Driver/spirv-amd-toolchain.c

@@ -12,7 +12,7 @@
 // BINDINGS: # "spirv64-amd-amdhsa" - "clang", inputs: ["[[INPUT:.+]]"], output: "[[OUTPUT:.+]]"
 // BINDINGS: # "spirv64-amd-amdhsa" - "AMDGCN::Linker", inputs: ["[[OUTPUT]]"], output: "a.out"
 
-// RUN: %clang -### --target=spirv64-amd-amdhsa %s -nogpulib -nogpuinc 2>&1 \
+// RUN: %clang -### --target=spirv64-amd-amdhsa %s 2>&1 \
 // RUN:   | FileCheck %s --check-prefix=INVOCATION
 // INVOCATION: "-cc1" "-triple" "spirv64-amd-amdhsa" {{.*}}"-disable-llvm-optzns" {{.*}} "-o" "[[OUTPUT:.+]]" "-x" "c"
 // INVOCATION: "{{.*}}llvm-link" "-o" "[[LINKED_OUTPUT:.+]]" "[[OUTPUT]]"