perf: cranelift: codegen: optimize RawInst print using fmt::Display

[dishmaker]

This decreases cargo llvm-lines from 1698144 to 1687711.

Change: -0.61%

Should decrease compile times too.

cargo llvm-lines -p cranelift-codegen -F anyhow,capstone,disas,enable-serde,gimli,host-arch,incremental-cache,postcard,pulley,serde,serde_derive,sha2,std,timing,unwind

Before:
  Lines                  Copies               Function name
  -----                  ------               -------------
  1698144                46552                (TOTAL)
    31987 (1.9%,  1.9%)      1 (0.0%,  0.0%)  cranelift_codegen[8ba54695291ce448]::isa::pulley_shared::inst::generated::print
    27885 (1.6%,  3.5%)      1 (0.0%,  0.0%)  cranelift_codegen[8ba54695291ce448]::isa::x64::lower::isle::generated_code::constructor_lower::<cranelift_codegen[8ba54695291ce448]::machinst::isle::IsleContext<cranelift_codegen[8ba54695291ce448]::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen[8ba54695291ce448]::isa::x64::X64Backend>>

After:
  Lines                  Copies               Function name
  -----                  ------               -------------
  1687711                46552                (TOTAL)
    27885 (1.7%,  1.7%)      1 (0.0%,  0.0%)  cranelift_codegen[8ba54695291ce448]::isa::x64::lower::isle::generated_code::constructor_lower::<cranelift_codegen[8ba54695291ce448]::machinst::isle::IsleContext<cranelift_codegen[8ba54695291ce448]::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen[8ba54695291ce448]::isa::x64::X64Backend>>
    22445 (1.3%,  3.0%)      1 (0.0%,  0.0%)  <cranelift_codegen[8ba54695291ce448]::isa::pulley_shared::inst::generated::RawInstDisplay as core[9cde01f631c9b89d]::fmt::Display>::fmt

rustc -V
rustc 1.99.0-nightly (da86f4d07 2026-07-24)

[dishmaker]

Oh. This actually increases llvm-lines on --release by +1.13%

[dishmaker]

Looks ok for --release too.
It reduces release wasmtime binary .text section by -0.057 %

cargo bloat: from 33.26 MiB to 33.24 MiB