[llvm] [SPIR-V][NFC] Remove unused helpers (PR #195804)

[Arseniy Obolenskiy via llvm-commits]

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@@ -579,7 +579,7 @@ void SPIRVModuleAnalysis::collectFuncNames(MachineInstr &MI,
       if (Lnk == SPIRV::LinkageType::Import) {
         // Map imported function name to function ID register.
         const Function *ImportedFunc =
-            F->getParent()->getFunction(getStringImm(MI, 2));
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aobolensk wrote:

Done

https://github.com/llvm/llvm-project/pull/195804