[llvm] [CodeGen][NewPM] Extract MachineFunctionProperties modification part to an RAII class (PR #94854)

[via llvm-commits]

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@@ -245,24 +245,27 @@ class PassManager : public PassInfoMixin<
     return PA;
   }
 
-  // FIXME: Revert to enable_if style when gcc >= 11.1
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paperchalice wrote:

This was introduced in https://github.com/llvm/llvm-project/commit/b361b5369ed4bb186f2a11459b1bc1d54d73a33e to distinguish machine function passes and ir passes. `MachinePassModel` is removed now, so we can revert to `enable_if` form.

https://github.com/llvm/llvm-project/pull/94854