[clang][Driver][OpenMP][SPIR-V] Fix SPIR-V OpenMP DeviceRTL expected file name (llvm#141855)

The option name to specify the path is `--libomptarget-spirv-bc-path` so
the existing error gives an invalid option name
(`--libomptarget-spirv64-bc-path`) when it can't find the file. Also the
expected file name is weird, we expect the file name to be
`libomptarget-spirv64.bc`. and use the same prefix `spirv64` to suggest
the option to the user.

Also the `nvptx` triple is `nvptx64` and the option/filename there is
just `nvptx`, so we should be consistent.

Signed-off-by: Sarnie, Nick <[email protected]>

Author: sarnex

clang/lib/Driver/ToolChains/CommonArgs.cpp

@@ -2811,7 +2811,7 @@ void tools::addOpenMPDeviceRTL(const Driver &D,
 
   StringRef ArchPrefix = Triple.isAMDGCN()  ? "amdgpu"
                          : Triple.isNVPTX() ? "nvptx"
-                                            : "spirv64";
+                                            : "spirv";
   std::string LibOmpTargetName = ("libomptarget-" + ArchPrefix + ".bc").str();
 
   // First check whether user specifies bc library

clang/test/Driver/Inputs/spirv-openmp/lib/libomptarget-spirv64.bc renamed to clang/test/Driver/Inputs/spirv-openmp/lib/libomptarget-spirv.bc

@@ -54,7 +54,7 @@
 
 // RUN: %clang -### --target=x86_64-unknown-linux-gnu -fopenmp=libomp -fopenmp-targets=spirv64-intel \
 // RUN: --sysroot=%S/Inputs/spirv-openmp/ %s 2>&1 | FileCheck --check-prefix=CHECK-GPULIB %s
-// CHECK-GPULIB: "-cc1" "-triple" "spirv64-intel"{{.*}}"-mlink-builtin-bitcode" "{{.*}}libomptarget-spirv64.bc"
+// CHECK-GPULIB: "-cc1" "-triple" "spirv64-intel"{{.*}}"-mlink-builtin-bitcode" "{{.*}}libomptarget-spirv.bc"
 
 // RUN: not %clang -### --target=x86_64-unknown-linux-gnu -fopenmp=libomp --offload-arch=spirv64-intel \
 // RUN:        --libomptarget-spirv-bc-path=%t/ -nogpulib %s 2>&1 \