hmmm...backing out my change on unix only to if memcmp() is actually SLOWER

(its faster on windows!)

xpcom/glue/nsID.h

@@ -72,7 +72,15 @@ struct nsID {
    */
 
   inline PRBool Equals(const nsID& other) const {
+#ifdef XP_UNIX
+    return (PRBool)
+      ((((PRUint32*) &m0)[0] == ((PRUint32*) &other.m0)[0]) &&
+       (((PRUint32*) &m0)[1] == ((PRUint32*) &other.m0)[1]) &&
+       (((PRUint32*) &m0)[2] == ((PRUint32*) &other.m0)[2]) &&
+       (((PRUint32*) &m0)[3] == ((PRUint32*) &other.m0)[3]));
+#else
     return (memcmp(this, &other, sizeof(*this)) == 0);
+#endif
   }
 
   /**