cranelift: Remove `next_fixed_nonallocatable` and `with_allocs` methods #23285

Job	Run time
Determine CI jobs to run	6s
Clang format	13s
Rustfmt	24s
Check	14m 24s
Check Windows ARM64	0s
Cargo deny	0s
Cargo vet	0s
Doc build	0s
Test Linux x86_64	16m 2s
Nightly tests	0s
Test MSRV on Linux x86_64	15m 28s
Test Linux x86_64 with MPK	17m 24s
Run benchmarks	0s
Test Linux arm64	20m 8s
Build wasi-preview1-component-adapter	0s
Test Linux s390x	21m 11s
Build wasmtime-target-wasm32	0s
Test Linux riscv64	18m 50s
Test C-API ${{ matrix.os }}	0s
Test the min-platform example	0s
Release build for ${{ matrix.build }}	0s
Meta deterministic check	0s
Miri	0s
verify-publish	0s
Cargo vet failed on a Pull Request	0s
Record the result of testing and building steps	1s
push-tag	0s
	2h 4m 11s

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