[regexp] Remove remainder of native RegExpExecStub

src/interface-descriptors.cc

Index: src/interface-descriptors.cc
diff --git a/src/interface-descriptors.cc b/src/interface-descriptors.cc
index a5dccc3583548c3efc25e426e3fee8ff6b9e75ed..619af3f7b9b128a0c9c456a7b1117677a2b8daf0 100644
--- a/src/interface-descriptors.cc
+++ b/src/interface-descriptors.cc
@@ -492,24 +492,6 @@ void CallICTrampolineDescriptor::InitializePlatformIndependent(
                                       machine_types);
 }
 
-void RegExpExecDescriptor::InitializePlatformIndependent(
-    CallInterfaceDescriptorData* data) {
-  // kString, kLastIndex, kStringStart, kStringEnd, kEntryPoint
-  MachineType machine_types[] = {MachineType::AnyTagged(), MachineType::Int32(),
-                                 MachineType::Pointer(), MachineType::Pointer(),
-                                 MachineType::AnyTagged()};
-  data->InitializePlatformIndependent(arraysize(machine_types), 0,
-                                      machine_types);
-}
-
-void RegExpExecDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {StringRegister(), LastIndexRegister(),
-                          StringStartRegister(), StringEndRegister(),
-                          CodeRegister()};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
 void BuiltinDescriptor::InitializePlatformIndependent(
     CallInterfaceDescriptorData* data) {
   // kTarget, kNewTarget, kArgumentsCount