add regression test for 140207

Author: the8472

tests/assembly/libs/issue-140207-slice-min-simd.rs

@@ -0,0 +1,13 @@
+//@ assembly-output: emit-asm
+// # avx has a dedicated instruction for this
+//@ compile-flags: --crate-type=lib -Ctarget-cpu=znver2 -Copt-level=3
+//@ only-x86_64
+//@ ignore-sgx
+// https://github.com/rust-lang/rust/issues/140207
+
+#[unsafe(no_mangle)]
+pub fn array_min(a: &[u16; 8]) -> u16 {
+    // CHECK: vphminposuw
+    // CHECK: ret
+    a.iter().copied().min().unwrap()
+}