stdarch-test: Modernization of the coding style

It modernizes the coding style of the crate stdarch-test by fixing
Clippy warnings.

Clippy: rust version 1.89.0-nightly (6f6971078 2025-05-28)
Number of Fixed Warnings: 1/1

Author: a4lg

crates/stdarch-test/src/lib.rs

@@ -71,7 +71,7 @@ pub fn assert(shim_addr: usize, fnname: &str, expected: &str) {
     //eprintln!("  function: {:?}", function);
 
     let mut instrs = &function.instrs[..];
-    while instrs.last().map_or(false, |s| s == "nop" || s == "int3") {
+    while instrs.last().is_some_and(|s| s == "nop" || s == "int3") {
         instrs = &instrs[..instrs.len() - 1];
     }