Rollup merge of #123833 - dpaoliello:stdarch, r=Amanieu

Update stdarch submodule

`asm_experimental_arch` is required in `core` as we're now using unstable inline assembly when building Arm64EC.

Brings in the fix for <rust-lang/stdarch#1555> (cc `@tslnc04).`

r? `@Amanieu`

Author: matthiaskrgr