Rollup merge of rust-lang#90591 - richlowe:illumos-ui-target, r=Mark-Simulacrum

treat illumos like solaris in failing ui tests which need it

Just adding the right cfg target for tests which fail because they don't know illumos is a thing.

(cc `````@jclulow)`````

Author: JohnTitor

src/test/ui/intrinsics/intrinsic-alignment.rs

@@ -15,6 +15,7 @@ mod rusti {
           target_os = "emscripten",
           target_os = "freebsd",
           target_os = "fuchsia",
+          target_os = "illumos",
           target_os = "linux",
           target_os = "macos",
           target_os = "netbsd",

src/test/ui/structs-enums/rec-align-u64.rs

@@ -36,6 +36,7 @@ struct Outer {
           target_os = "emscripten",
           target_os = "freebsd",
           target_os = "fuchsia",
+          target_os = "illumos",
           target_os = "linux",
           target_os = "macos",
           target_os = "netbsd",

src/test/ui/x86stdcall.rs

@@ -28,10 +28,11 @@ pub fn main() {
           target_os = "emscripten",
           target_os = "freebsd",
           target_os = "fuchsia",
+          target_os = "illumos",
           target_os = "linux",
           target_os = "macos",
           target_os = "netbsd",
           target_os = "openbsd",
-          target_os = "vxworks",
-          target_os = "solaris"))]
+          target_os = "solaris",
+          target_os = "vxworks"))]
 pub fn main() { }