Check for doubles that fit in ints in JSOP_GETELEM slow paths (bug 604905, r=luke).

js/src/jsinterp.cpp

@@ -4504,9 +4504,14 @@ BEGIN_CASE(JSOP_GETELEM)
         else
             goto intern_big_int;
     } else {
-      intern_big_int:
-        if (!js_InternNonIntElementId(cx, obj, rref, &id))
-            goto error;
+        int32_t i;
+        if (ValueFitsInInt32(rref, &i) && INT_FITS_IN_JSID(i)) {
+            id = INT_TO_JSID(i);
+        } else {
+          intern_big_int:
+            if (!js_InternNonIntElementId(cx, obj, rref, &id))
+                goto error;
+        }
     }
 
     if (!obj->getProperty(cx, id, &rval))

js/src/methodjit/StubCalls.cpp

@@ -487,9 +487,14 @@ stubs::GetElem(VMFrame &f)
             goto intern_big_int;
 
     } else {
-      intern_big_int:
-        if (!js_InternNonIntElementId(cx, obj, rref, &id))
-            THROW();
+        int32_t i;
+        if (ValueFitsInInt32(rref, &i) && INT_FITS_IN_JSID(i)) {
+            id = INT_TO_JSID(i);
+        } else {
+          intern_big_int:
+            if (!js_InternNonIntElementId(cx, obj, rref, &id))
+                THROW();
+        }
     }
 
     if (!obj->getProperty(cx, id, &rval))