[clang] [CIR] Cleanup support for C functions (PR #136854)

[Andy Kaylor via cfe-commits]

================
@@ -47,18 +98,51 @@ class CIRGenFunctionInfo final
 
   // This function has to be CamelCase because llvm::FoldingSet requires so.
   // NOLINTNEXTLINE(readability-identifier-naming)
-  static void Profile(llvm::FoldingSetNodeID &id, CanQualType resultType) {
+  static void Profile(llvm::FoldingSetNodeID &id, RequiredArgs required,
+                      CanQualType resultType,
+                      llvm::ArrayRef<CanQualType> argTypes) {
+    id.AddBoolean(required.getOpaqueData());
     resultType.Profile(id);
+    for (const auto &arg : argTypes)
----------------
andykaylor wrote:

```suggestion
    for (const CanQualType &type : argTypes)
```

https://github.com/llvm/llvm-project/pull/136854
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