style: Always inline GeckoElement::has_class.

It's easier, and probably faster, than trying to inline the function call to
Gecko.

This symbol is in libxul.so as of right now.

components/style/gecko/snapshot_helpers.rs

@@ -34,7 +34,7 @@ pub fn has_class<T>(
                 let classes = slice::from_raw_parts(list, n as usize);
                 match case_sensitivity {
                     CaseSensitivity::CaseSensitive => {
-                        classes.iter().any(|ptr| name == WeakAtom::new(*ptr))
+                        classes.iter().any(|ptr| &**name == WeakAtom::new(*ptr))
                     }
                     CaseSensitivity::AsciiCaseInsensitive => {
                         classes.iter().any(|ptr| name.eq_ignore_ascii_case(WeakAtom::new(*ptr)))

components/style/gecko/wrapper.rs

@@ -2191,7 +2191,7 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
         }
     }
 
-    #[inline]
+    #[inline(always)]
     fn has_class(&self, name: &Atom, case_sensitivity: CaseSensitivity) -> bool {
         if !self.may_have_class() {
             return false;