Revert broken ArrayPop changes

src/ia32/stub-cache-ia32.cc

Index: src/ia32/stub-cache-ia32.cc
diff --git a/src/ia32/stub-cache-ia32.cc b/src/ia32/stub-cache-ia32.cc
index e76bfb5f3bf87569557897cad25d486e29818070..92b2f9356cb6da87b2d613cb2d596ebe5c6aa468 100644
--- a/src/ia32/stub-cache-ia32.cc
+++ b/src/ia32/stub-cache-ia32.cc
@@ -1616,6 +1616,76 @@ Handle<Code> CallStubCompiler::CompileCallField(Handle<JSObject> object,
 }
 
 
+Handle<Code> CallStubCompiler::CompileArrayPopCall(
+    Handle<Object> object,
+    Handle<JSObject> holder,
+    Handle<Cell> cell,
+    Handle<JSFunction> function,
+    Handle<String> name,
+    Code::StubType type) {
+  // If object is not an array or is observed or sealed, bail out to regular
+  // call.
+  if (!object->IsJSArray() ||
+      !cell.is_null() ||
+      Handle<JSArray>::cast(object)->map()->is_observed() ||
+      !Handle<JSArray>::cast(object)->map()->is_extensible()) {
+    return Handle<Code>::null();
+  }
+
+  Label miss, return_undefined, call_builtin;
+
+  HandlerFrontendHeader(object, holder, name, RECEIVER_MAP_CHECK, &miss);
+
+  // Get the elements array of the object.
+  __ mov(ebx, FieldOperand(edx, JSArray::kElementsOffset));
+
+  // Check that the elements are in fast mode and writable.
+  __ cmp(FieldOperand(ebx, HeapObject::kMapOffset),
+         Immediate(factory()->fixed_array_map()));
+  __ j(not_equal, &call_builtin);
+
+  // Get the array's length into ecx and calculate new length.
+  __ mov(ecx, FieldOperand(edx, JSArray::kLengthOffset));
+  __ sub(ecx, Immediate(Smi::FromInt(1)));
+  __ j(negative, &return_undefined);
+
+  // Get the last element.
+  STATIC_ASSERT(kSmiTagSize == 1);
+  STATIC_ASSERT(kSmiTag == 0);
+  __ mov(eax, FieldOperand(ebx,
+                           ecx, times_half_pointer_size,
+                           FixedArray::kHeaderSize));
+  __ cmp(eax, Immediate(factory()->the_hole_value()));
+  __ j(equal, &call_builtin);
+
+  // Set the array's length.
+  __ mov(FieldOperand(edx, JSArray::kLengthOffset), ecx);
+
+  // Fill with the hole.
+  __ mov(FieldOperand(ebx,
+                      ecx, times_half_pointer_size,
+                      FixedArray::kHeaderSize),
+         Immediate(factory()->the_hole_value()));
+  const int argc = arguments().immediate();
+  __ ret((argc + 1) * kPointerSize);
+
+  __ bind(&return_undefined);
+  __ mov(eax, Immediate(factory()->undefined_value()));
+  __ ret((argc + 1) * kPointerSize);
+
+  __ bind(&call_builtin);
+  __ TailCallExternalReference(
+      ExternalReference(Builtins::c_ArrayPop, isolate()),
+      argc + 1,
+      1);
+
+  HandlerFrontendFooter(&miss);
+
+  // Return the generated code.
+  return GetCode(type, name);
+}
+
+
 Handle<Code> CallStubCompiler::CompileFastApiCall(
     const CallOptimization& optimization,
     Handle<Object> object,