[regexp] Remove remainder of native RegExpExecStub

src/interface-descriptors.h

Index: src/interface-descriptors.h
diff --git a/src/interface-descriptors.h b/src/interface-descriptors.h
index b97c45cd0e902829b8d04d2b22fb2e4aeed3c7ec..4a42862afa0b678969684db02a849b7683271abf 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -49,7 +49,6 @@ class PlatformInterfaceDescriptor;
   V(CallTrampoline)                        \
   V(ConstructStub)                         \
   V(ConstructTrampoline)                   \
-  V(RegExpExec)                            \
   V(TransitionElementsKind)                \
   V(AllocateHeapNumber)                    \
   V(Builtin)                               \
@@ -613,19 +612,6 @@ class CallConstructDescriptor : public CallInterfaceDescriptor {
   DECLARE_DESCRIPTOR(CallConstructDescriptor, CallInterfaceDescriptor)
 };
 
-class RegExpExecDescriptor : public CallInterfaceDescriptor {
- public:
-  DEFINE_PARAMETERS(kString, kLastIndex, kStringStart, kStringEnd, kCode)
-  DECLARE_DESCRIPTOR_WITH_CUSTOM_FUNCTION_TYPE(RegExpExecDescriptor,
-                                               CallInterfaceDescriptor)
-
-  static const Register StringRegister();
-  static const Register LastIndexRegister();
-  static const Register StringStartRegister();
-  static const Register StringEndRegister();
-  static const Register CodeRegister();
-};
-
 class TransitionElementsKindDescriptor : public CallInterfaceDescriptor {
  public:
   DEFINE_PARAMETERS(kObject, kMap)