[llvm] [NFC][SPIRV] Use `StringRef` by value (no `const`, no `&`) (PR #207940)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/lib/Target/SPIRV/SPIRVBuiltins.cpp llvm/lib/Target/SPIRV/SPIRVBuiltins.h llvm/lib/Target/SPIRV/SPIRVGlobalRegistry.cpp llvm/lib/Target/SPIRV/SPIRVMetadata.cpp llvm/lib/Target/SPIRV/SPIRVUtils.cpp llvm/lib/Target/SPIRV/SPIRVUtils.h --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/SPIRV/SPIRVUtils.cpp b/llvm/lib/Target/SPIRV/SPIRVUtils.cpp
index d3feb6d20..cb4ecee69 100644
--- a/llvm/lib/Target/SPIRV/SPIRVUtils.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVUtils.cpp
@@ -180,7 +180,6 @@ void addStringImm(StringRef Str, MachineInstrBuilder &MIB) {
   }
 }
 
-
 std::string getStringImm(const MachineInstr &MI, unsigned StartIndex) {
   return getSPIRVStringOperand(MI, StartIndex);
 }

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https://github.com/llvm/llvm-project/pull/207940