pulley: Remove special registers as candidates from regalloc #26575

Job	Run time
Determine CI jobs to run	13s
Check illumos	3m 6s
Clang format	13s
Clippy	5m 47s
Check JS	8s
Check wasmtime	4m 13s
Monolith Checks	3m 36s
no_std checks	50s
Check wasmtime-cli	3m 37s
Rustfmt	31s
Check cranelift-codegen	1m 4s
Check wasmtime-bench-api	1m 16s
Check wasmtime-c-api	1m 9s
Cargo vet	0s
Doc build	0s
Cargo deny	0s
Check Windows ARM64	0s
Nightly tests	4m 37s
Tests on i686-unknown-linux-gnu	53s
Test C-API ${{ matrix.os }}	0s
Tests on armv7-unknown-linux-gnueabihf	1m 3s
Test DWARF debugging	0s
Test wasmtime-fuzzing	0s
Test wasi-nn (${{ matrix.feature }}, ${{ matrix.os }})	0s
Run benchmarks	0s
Build wasi-preview1-component-adapter	0s
Build wasmtime-target-wasm32	0s
Miri (wasmtime)	5m 57s
Test the min-platform example	0s
Miri (wasmtime-cli)	14m 37s
Miri (wasmtime-environ)	1m 2s
Release build for ${{ matrix.build }}	0s
Miri (pulley-interpreter --all-features)	2m 33s
Meta deterministic check	0s
verify-publish	0s
Cargo vet failed on a Pull Request	0s
Build wasi-preview1-component-adapter-provider	0s
Record the result of testing and building steps	1s
push-tag	0s
	56m 26s

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