Remove support for Object.observe

src/ic/ppc/ic-ppc.cc

Index: src/ic/ppc/ic-ppc.cc
diff --git a/src/ic/ppc/ic-ppc.cc b/src/ic/ppc/ic-ppc.cc
index 7735a23f339231d6a83651d6ec14de80a7fb6c7c..3c867865bb11bf9ceca386cb1737e5382deaf782 100644
--- a/src/ic/ppc/ic-ppc.cc
+++ b/src/ic/ppc/ic-ppc.cc
@@ -639,11 +639,10 @@ void KeyedStoreIC::GenerateMegamorphic(MacroAssembler* masm,
   __ JumpIfSmi(receiver, &slow);
   // Get the map of the object.
   __ LoadP(receiver_map, FieldMemOperand(receiver, HeapObject::kMapOffset));
-  // Check that the receiver does not require access checks and is not observed.
-  // The generic stub does not perform map checks or handle observed objects.
+  // Check that the receiver does not require access checks.
+  // The generic stub does not perform map checks.
   __ lbz(ip, FieldMemOperand(receiver_map, Map::kBitFieldOffset));
-  __ andi(r0, ip,
-          Operand(1 << Map::kIsAccessCheckNeeded | 1 << Map::kIsObserved));
+  __ andi(r0, ip, Operand(1 << Map::kIsAccessCheckNeeded));
   __ bne(&slow, cr0);
   // Check if the object is a JS array or not.
   __ lbz(r7, FieldMemOperand(receiver_map, Map::kInstanceTypeOffset));