Revert broken ArrayPop changes

src/mips/stub-cache-mips.cc

Index: src/mips/stub-cache-mips.cc
diff --git a/src/mips/stub-cache-mips.cc b/src/mips/stub-cache-mips.cc
index ef98db59bb8288a52e746dbb9d0a79c9456a5acf..b713be98a3f59ba61265af1c1f20f52baf7299e2 100644
--- a/src/mips/stub-cache-mips.cc
+++ b/src/mips/stub-cache-mips.cc
@@ -1585,6 +1585,78 @@ 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;
+  Register receiver = a0;
+  Register scratch = a1;
+  Register elements = a3;
+  HandlerFrontendHeader(object, holder, name, RECEIVER_MAP_CHECK, &miss);
+
+  // Get the elements array of the object.
+  __ lw(elements, FieldMemOperand(receiver, JSArray::kElementsOffset));
+
+  // Check that the elements are in fast mode and writable.
+  __ CheckMap(elements,
+              scratch,
+              Heap::kFixedArrayMapRootIndex,
+              &call_builtin,
+              DONT_DO_SMI_CHECK);
+
+  // Get the array's length into t0 and calculate new length.
+  __ lw(t0, FieldMemOperand(receiver, JSArray::kLengthOffset));
+  __ Subu(t0, t0, Operand(Smi::FromInt(1)));
+  __ Branch(&return_undefined, lt, t0, Operand(zero_reg));
+
+  // Get the last element.
+  __ LoadRoot(t2, Heap::kTheHoleValueRootIndex);
+  STATIC_ASSERT(kSmiTagSize == 1);
+  STATIC_ASSERT(kSmiTag == 0);
+  // We can't address the last element in one operation. Compute the more
+  // expensive shift first, and use an offset later on.
+  __ sll(t1, t0, kPointerSizeLog2 - kSmiTagSize);
+  __ Addu(elements, elements, t1);
+  __ lw(scratch, FieldMemOperand(elements, FixedArray::kHeaderSize));
+  __ Branch(&call_builtin, eq, scratch, Operand(t2));
+
+  // Set the array's length.
+  __ sw(t0, FieldMemOperand(receiver, JSArray::kLengthOffset));
+
+  // Fill with the hole.
+  __ sw(t2, FieldMemOperand(elements, FixedArray::kHeaderSize));
+  const int argc = arguments().immediate();
+  __ mov(v0, scratch);
+  __ DropAndRet(argc + 1);
+
+  __ bind(&return_undefined);
+  __ LoadRoot(v0, Heap::kUndefinedValueRootIndex);
+  __ DropAndRet(argc + 1);
+
+  __ 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,