[Object.observe] Don't force normalization of elements for observed objects

src/arm/ic-arm.cc

Index: src/arm/ic-arm.cc
diff --git a/src/arm/ic-arm.cc b/src/arm/ic-arm.cc
index aded4c1dd8b7f8d0beedafd5cc16919834b3fba6..92cdf1e76a804e593461096d8e2da7851c89833e 100644
--- a/src/arm/ic-arm.cc
+++ b/src/arm/ic-arm.cc
@@ -1408,6 +1408,11 @@ void KeyedStoreIC::GenerateGeneric(MacroAssembler* masm,
   __ ldrb(ip, FieldMemOperand(receiver_map, Map::kBitFieldOffset));
   __ tst(ip, Operand(1 << Map::kIsAccessCheckNeeded));
   __ b(ne, &slow);
+  // Check that the receiver is not observed.  Observed objects are always
+  // handled by the runtime.
+  __ ldrb(ip, FieldMemOperand(receiver_map, Map::kBitFieldOffset));
+  __ tst(ip, Operand(1 << Map::kIsObserved));

[danno, 2013/11/06 15:25:11]

Here and other platforms, just or this into the constant in the tst above.

[rafaelw, 2013/11/07 15:45:07]

Done.

+  __ b(ne, &slow);
   // Check if the object is a JS array or not.
   __ ldrb(r4, FieldMemOperand(receiver_map, Map::kInstanceTypeOffset));
   __ cmp(r4, Operand(JS_ARRAY_TYPE));