Merge backout on TM tip to mozilla-central. (a=blockers)

js/src/jsiter.cpp

@@ -468,7 +468,7 @@ RegisterEnumerator(JSContext *cx, JSObject *iterobj, NativeIterator *ni)
         cx->enumerators = iterobj;
 
         JS_ASSERT(!(ni->flags & JSITER_ACTIVE));
-        ni->flags |= (JSITER_ACTIVE | JSITER_REUSABLE);
+        ni->flags |= JSITER_ACTIVE;
     }
 }
 
@@ -788,7 +788,7 @@ js_CloseIterator(JSContext *cx, JSObject *obj)
         /* Remove enumerators from the active list, which is a stack. */
         NativeIterator *ni = obj->getNativeIterator();
 
-        if (ni->flags & JSITER_REUSABLE) {
+        if (ni->flags & JSITER_ENUMERATE) {
             JS_ASSERT(cx->enumerators == obj);
             cx->enumerators = ni->next;
 
@@ -882,10 +882,6 @@ SuppressDeletedPropertyHelper(JSContext *cx, JSObject *obj, IdPredicate predicat
                         memmove(idp, idp + 1, (props_end - (idp + 1)) * sizeof(jsid));
                         ni->props_end = ni->end() - 1;
                     }
-
-                    /* Don't reuse modified native iterators. */
-                    ni->flags &= (~JSITER_REUSABLE);
-
                     if (predicate.matchesAtMostOne())
                         break;
                 }

js/src/jsiter.h

@@ -64,7 +64,6 @@
  * Not serialized by XDR.
  */
 #define JSITER_ACTIVE     0x1000
-#define JSITER_REUSABLE   0x2000
 
 namespace js {
 

js/src/methodjit/Compiler.cpp

@@ -4224,10 +4224,10 @@ mjit::Compiler::iterEnd()
     Address flagAddr(T1, offsetof(NativeIterator, flags));
     masm.loadPtr(flagAddr, T2);
 
-    /* Test for (flags & REUSABLE). */
+    /* Test for (flags == ENUMERATE | ACTIVE). */
-    Jump notReusable = masm.branchTest32(Assembler::Zero, T2,
+    Jump notEnumerate = masm.branch32(Assembler::NotEqual, T2,
-                                         Imm32(JSITER_REUSABLE));
+                                      Imm32(JSITER_ENUMERATE | JSITER_ACTIVE));
-    stubcc.linkExit(notReusable, Uses(1));
+    stubcc.linkExit(notEnumerate, Uses(1));
 
     /* Clear active bit. */
     masm.and32(Imm32(~JSITER_ACTIVE), T2);