PPC: VectorICs: New interface descriptor for vector transitioning stores.

Port cd351559

R=mvstanton@chromium.org, jyan@ca.ibm.com, dstence@us.ibm.com, joransiu@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1319763004

Cr-Commit-Position: refs/heads/master@{#30393}

src/ppc/interface-descriptors-ppc.cc

@@ -31,6 +31,11 @@ const Register VectorStoreICTrampolineDescriptor::SlotRegister() { return r7; }
 const Register VectorStoreICDescriptor::VectorRegister() { return r6; }
 
 
+const Register VectorStoreTransitionDescriptor::SlotRegister() { return r7; }
+const Register VectorStoreTransitionDescriptor::VectorRegister() { return r6; }
+const Register VectorStoreTransitionDescriptor::MapRegister() { return r8; }
+
+
 const Register StoreTransitionDescriptor::MapRegister() { return r6; }
 
 
@@ -64,10 +69,10 @@ const Register GrowArrayElementsDescriptor::ObjectRegister() { return r3; }
 const Register GrowArrayElementsDescriptor::KeyRegister() { return r6; }
 
 
-void StoreTransitionDescriptor::InitializePlatformSpecific(
+void VectorStoreTransitionDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
-  Register registers[] = {ReceiverRegister(), NameRegister(), ValueRegister(),
-                          MapRegister()};
+  Register registers[] = {ReceiverRegister(), NameRegister(),   ValueRegister(),
+                          SlotRegister(),     VectorRegister(), MapRegister()};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }