[NFC][libspirv] Add test for remangled libspirv bitcode files#20950

wenju-he wants to merge 4 commits intointel:syclintel/llvm:syclfrom

wenju-he:nfc-libclc-test-remangled-libspirvwenju-he/llvm:nfc-libclc-test-remangled-libspirvCopy head branch name to clipboard