Merge `wasmtime-math` into `wasmtime-core` (#12398)

* Merge `wasmtime-math` into `wasmtime-core`

No real need to have two "core" crates, let's just have one.

* Fix warnings

cranelift-codegen: rename most uses of std to core and alloc (#12237)

* rename most std uses to core and alloc

* cargo fmt

Cranelift: make all non-tail, non-indirect calls patchable, and rename patchable ABI to `preserve_all`. (#12160)

* Cranelift: make all non-tail, non-indirect calls patchable, and rename patchable AB

Cranelift: make all non-tail, non-indirect calls patchable, and rename patchable ABI to `preserve_all`. (#12160)

* Cranelift: make all non-tail, non-indirect calls patchable, and rename patchable ABI to `preserve_all`.

As discussed in this week's Cranelift meeting, we've discovered a need
to generalize the `patchable_call` mechanism and corresponding
`patchable` ABI slightly. In particular, we will need patchable
`try_call` callsites as well in order to allow breakpoint handlers to
throw exceptions (desirable functionality eventually) and have this work
in the presence of inlining. Also, it's just a nice generalization to
say that patchability is an orthogonal dimension to the call ABI and the
other restrictions we initially imposed, and works as long as the basic
requirement (no return values) is met.

This also renames the `patchable` ABI to `preserve_all`, to make it
clear that its purpose is actually orthogonal, and it can be used
independently of patchable callsites. It also deletes the `cold` ABI,
which never actually did anything and is misleading in the presence of
an actual cold-ish (subzero temperature, actually) ABI like
`preserve_all`.

* Review feedback.

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riscv64: Implement near relocations (#11585)

* riscv64: Implement near relocations

This is the same as #11570 but for the riscv64 backend. The intention is
to support "near" relocations which don't

riscv64: Implement near relocations (#11585)

* riscv64: Implement near relocations

This is the same as #11570 but for the riscv64 backend. The intention is
to support "near" relocations which don't require `Abs8` relocations for
upcoming use in Wasmtime. The same design as #11570 is used here.

* Review comments

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Remove `expect(clippy::allow_attributes_without_reason)` from cranelift-codegen (#11182)

* Remove `expect(clippy::allow_attributes_without_reason)` from cranelift-codegen

This commit gets around to

Remove `expect(clippy::allow_attributes_without_reason)` from cranelift-codegen (#11182)

* Remove `expect(clippy::allow_attributes_without_reason)` from cranelift-codegen

This commit gets around to migrating the `cranelift-codegen` crate to
require a reason on lint directives and additionally switch to
`#[expect]` where possible.

prtest:full

* Move x64-only item to x64 backend

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