[llvm] [TableGen] Change backend callback to require const RecordKeeper (PR #111064)

[Rahul Joshi via llvm-commits]

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@@ -23,8 +23,7 @@ class RecordKeeper;
 class raw_ostream;
 
 namespace TableGen::Emitter {
-// Supports const and non-const forms of callback functions.
-using FnT = function_ref<void(RecordKeeper &Records, raw_ostream &OS)>;
+using FnT = void (*)(const RecordKeeper &Records, raw_ostream &OS);
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jurahul wrote:

Done.

https://github.com/llvm/llvm-project/pull/111064