Unrolled build for #157714 Rollup merge of #157714 - hanna-kruppe:fmt-pointer, r=LawnGnome Improve polymorphization of raw pointer formatting This reduces the amount of LLVM IR rustc generates for basically every use of `fmt::Pointer` by several hundred lines per pointee type. Most of the gain is from side-stepping a code size issue with the current implementation of `Formatter::with_field`. But even if those were fixed, it would still be an improvement: * The "is it a thin pointer?" check can't be eliminated during codegen, so rustc codegens *both* branches for every pointer type and LLVM has to clean it up later. * For wide pointers, the use of `DebugStruct` isn't a *lot* of code, but it's still a bit of extra code per wide pointer type that can easily be shared across all wide pointer types.
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