[llvm] [SPIRV][NFC] Refactor pointer creation in GlobalRegistery (PR #134429)

[Nathan Gauër via llvm-commits]

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@@ -466,6 +466,14 @@ class SPIRVGlobalRegistry : public SPIRVIRMapping {
                                          Constant *CA, unsigned BitWidth,
                                          unsigned ElemCnt);
 
+  // Returns a pointer to a SPIR-V pointer type with the given base type and
+  // storage class. It is the responsibility of the caller to make sure the
+  // decorations on the base type are valid for the given storage class. For
+  // example, it has the correct offset and stride decorations.
+  SPIRVType *getOrCreateSPIRVPointerTypeInternal(
+      SPIRVType *BaseType, MachineIRBuilder &MIRBuilder,
+      SPIRV::StorageClass::StorageClass SClass = SPIRV::StorageClass::Function);
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Keenuts wrote:

Default value is never used, remove?

https://github.com/llvm/llvm-project/pull/134429