[clang] [CIR] Handle FunctionToPointerDecay casts (#153657) (PR #154060)

[Morris Hafner via cfe-commits]

================
@@ -553,6 +591,35 @@ RValue CIRGenFunction::emitLoadOfLValue(LValue lv, 
SourceLocation loc) {
   return RValue::get(nullptr);
 }
 
+static cir::FuncOp emitFunctionDeclPointer(CIRGenModule &cgm, GlobalDecl gd) {
+  assert(!cir::MissingFeatures::weakRefReference());
+  return cgm.getAddrOfFunction(gd);
+}
+
+static LValue emitFunctionDeclLValue(CIRGenFunction &CGF, const Expr *E,
+                                     GlobalDecl GD) {
+  const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
----------------
mmha wrote:

```suggestion
static LValue emitFunctionDeclLValue(CIRGenFunction &cgf, const Expr *e,
                                     GlobalDecl gd) {
  const FunctionDecl *fd = cast<FunctionDecl>(gd.getDecl());
```

Also make sure to change the variable names in the rest of the function body.

https://github.com/llvm/llvm-project/pull/154060
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