Bug 618485: Finally remove uintptr_t word payload union member on 64BE, it grows jsval_layout size and is unused. r=luke

js/public/Value.h

@@ -321,7 +321,6 @@ typedef union jsval_layout
             int32_t        i32;
             uint32_t       u32;
             JSWhyMagic     why;
-            uintptr_t      word;
         } payload;
     } s;
     double asDouble;