[clang] [llvm] [IR] Do not store Function inside BlockAddress (PR #137958)

[Matt Arsenault via cfe-commits]

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@@ -920,8 +925,8 @@ class BlockAddress final : public Constant {
   /// Transparently provide more efficient getOperand methods.
   DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
 
-  Function *getFunction() const { return (Function *)Op<0>().get(); }
-  BasicBlock *getBasicBlock() const { return (BasicBlock *)Op<1>().get(); }
+  BasicBlock *getBasicBlock() const { return (BasicBlock *)Op<0>().get(); }
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arsenm wrote:

`cast` or `static_cast`?

https://github.com/llvm/llvm-project/pull/137958