[clang] [CIR] Upstream support for pointer-to-method casts (PR #178004)

[Erich Keane via cfe-commits]

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@@ -86,6 +86,18 @@ class CIRCXXABI {
   lowerDerivedDataMember(cir::DerivedDataMemberOp op, mlir::Value loweredSrc,
                          mlir::OpBuilder &builder) const = 0;
 
+  /// Lower the given cir.base_method op to a sequence of more "primitive" CIR
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erichkeane wrote:

IF we're just copy/pasting these comments for each, they seem to offer very little value...

https://github.com/llvm/llvm-project/pull/178004