PPC: [runtime] Introduce FastNewStrictArgumentsStub to optimize strict arguments.

src/ppc/builtins-ppc.cc

Index: src/ppc/builtins-ppc.cc
diff --git a/src/ppc/builtins-ppc.cc b/src/ppc/builtins-ppc.cc
index b03cf5f5dcdbaa189915802c50030bce91193125..c393779341521216080991cf168122354cc1f5a3 100644
--- a/src/ppc/builtins-ppc.cc
+++ b/src/ppc/builtins-ppc.cc
@@ -1991,9 +1991,7 @@ void Builtins::Generate_Apply(MacroAssembler* masm) {
 
     // Try to create the list from an arguments object.
     __ bind(&create_arguments);
-    __ LoadP(r5, FieldMemOperand(
-                     r3, JSObject::kHeaderSize +
-                             Heap::kArgumentsLengthIndex * kPointerSize));
+    __ LoadP(r5, FieldMemOperand(r3, JSArgumentsObject::kLengthOffset));
     __ LoadP(r7, FieldMemOperand(r3, JSObject::kElementsOffset));
     __ LoadP(ip, FieldMemOperand(r7, FixedArray::kLengthOffset));
     __ cmp(r5, ip);