X87: Unify InstanceofStub interface descriptors

port r22755.

original commit message:
  Unify InstanceofStub interface descriptors

BUG=
R=mstarzinger@chromium.org, weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/435603007

Patch from Chunyang Dai <chunyang.dai@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22780 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x87/code-stubs-x87.cc

@@ -84,22 +84,15 @@ void CreateAllocationSiteStub::InitializeInterfaceDescriptor(
 }
 
 
-void InstanceofStub::InitializeInterfaceDescriptor(
-    Isolate* isolate, CodeStubInterfaceDescriptor* descriptor) {
-  Register registers[] = {esi, left(), right()};
-  descriptor->Initialize(MajorKey(), ARRAY_SIZE(registers), registers);
-}
-
-
 void CallFunctionStub::InitializeInterfaceDescriptor(
-    Isolate* isolate, CodeStubInterfaceDescriptor* descriptor) {
+    CodeStubInterfaceDescriptor* descriptor) {
   Register registers[] = {esi, edi};
   descriptor->Initialize(MajorKey(), ARRAY_SIZE(registers), registers);
 }
 
 
 void CallConstructStub::InitializeInterfaceDescriptor(
-    Isolate* isolate, CodeStubInterfaceDescriptor* descriptor) {
+    CodeStubInterfaceDescriptor* descriptor) {
   // eax : number of arguments
   // ebx : feedback vector
   // edx : (only if ebx is not the megamorphic symbol) slot in feedback