rusticl/program: handle -cl-no-subgroup-ifp

As per spec we don't have to do anything with that flag.

Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28873>
(cherry picked from commit cd5c9870ea)

.pick_status.json

@@ -4,7 +4,7 @@
         "description": "rusticl/program: handle -cl-no-subgroup-ifp",
         "nominated": true,
         "nomination_type": 0,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null,
         "notes": null

src/gallium/frontends/rusticl/core/program.rs

@@ -314,9 +314,11 @@ fn prepare_options(options: &str, dev: &Device) -> Vec<CString> {
     res.push(&options[old..]);
 
     res.iter()
-        .map(|&a| match a {
-            "-cl-denorms-are-zero" => "-fdenormal-fp-math=positive-zero",
-            _ => a,
+        .filter_map(|&a| match a {
+            "-cl-denorms-are-zero" => Some("-fdenormal-fp-math=positive-zero"),
+            // We can ignore it as long as we don't support ifp
+            "-cl-no-subgroup-ifp" => None,
+            _ => Some(a),
         })
         .map(CString::new)
         .map(Result::unwrap)