PPC/s390: [stubs] Remove TransitionElementsKindStub

Port a55d8632

Original Commit Message:

    Its contents are now inlined into the one remaining call site.

R=jgruber@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: If0ba82784c0b9b095301e88141e1ff5b1fd507be
Reviewed-on: https://chromium-review.googlesource.com/1075607Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#53393}

src/ppc/interface-descriptors-ppc.cc

@@ -188,12 +188,6 @@ void ConstructTrampolineDescriptor::InitializePlatformSpecific(
 }
 
 
-void TransitionElementsKindDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {r3, r4};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
 void AbortJSDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {r4};

src/s390/interface-descriptors-s390.cc

@@ -184,12 +184,6 @@ void ConstructTrampolineDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
-void TransitionElementsKindDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {r2, r3};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
 void AbortJSDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {r3};