Try to fix x86_64-apple-darwin release builds (#12245)

This is an attempt to address #12217 which applies a similar workaround
found in #11960 to this naked function as well. Effectively it looks
li

Try to fix x86_64-apple-darwin release builds (#12245)

This is an attempt to address #12217 which applies a similar workaround
found in #11960 to this naked function as well. Effectively it looks
like `#[unsafe(naked)]` is buggy to the point that the user of the
function symbol must be `#[inline(never)]` and in the same module,
otherwise it won't work correctly.

Closes #12217

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Use `naked_asm!`, delete `asm_func!` (#11405)

This deletes our home-grown `asm_func!` macro in favor of using
`#[unsafe(naked)]` functions within Wasmtime. This is needed for
fiber-related bits righ

Use `naked_asm!`, delete `asm_func!` (#11405)

This deletes our home-grown `asm_func!` macro in favor of using
`#[unsafe(naked)]` functions within Wasmtime. This is needed for
fiber-related bits right now where we need tight control over the exact
assembly of some functions. This additionally migrates s390x fiber bits
to Rust as inline assembly is now stable for s390x.

prtest:full

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