[compiler-rt] [compiler-rt] Disable executable stack on `aeabi_u{read,write}*.S` (PR #214465)

[Trevor Gross via llvm-commits]

tgross35 wrote:

Picked up in part of rust's CI https://github.com/rust-lang/compiler-builtins/pull/1246#issuecomment-5203655312

@compnerd @simpal01 @statham-arm @vhscampos could you review? (rt maintainer plus reviewer from where this was introduced)

https://github.com/llvm/llvm-project/pull/214465