Rollup merge of #144705 - pmur:murp/aarch64-lse, r=Amanieu

compiler-builtins: plumb LSE support for aarch64 on linux/gnu when optimized-compiler-builtins not enabled

Add dynamic support for aarch64 LSE atomic ops on linux/gnu targets when optimized-compiler-builtins is not enabled.

Enabling LSE is the primary motivator for rust-lang/rust#143689, though extending the rust version doesn't seem too farfetched. Are there more details which I have overlooked which make this impractical? I've tested this on an aarch64 host with LSE.

r? ```````@tgross35```````

Author: tgross35