[runtime] Optimize and unify rest parameters.

src/interface-descriptors.h

Index: src/interface-descriptors.h
diff --git a/src/interface-descriptors.h b/src/interface-descriptors.h
index 1c71d0f94005d5121d68aa8bc6afd6910e0de56f..f9720dfc50f3af69b482f3dbab92ed806c8d0000 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -25,6 +25,7 @@ class PlatformInterfaceDescriptor;
   V(LoadWithVector)                           \
   V(FastNewClosure)                           \
   V(FastNewContext)                           \
+  V(FastNewRestParameter)                     \
   V(ToNumber)                                 \
   V(ToLength)                                 \
   V(ToString)                                 \
@@ -69,7 +70,6 @@ class PlatformInterfaceDescriptor;
   V(ApiGetter)                                \
   V(ArgumentsAccessRead)                      \
   V(ArgumentsAccessNew)                       \
-  V(RestParamAccess)                          \
   V(LoadGlobalViaContext)                     \
   V(StoreGlobalViaContext)                    \
   V(MathPowTagged)                            \
@@ -80,7 +80,6 @@ class PlatformInterfaceDescriptor;
   V(InterpreterPushArgsAndConstruct)          \
   V(InterpreterCEntry)
 
-
 class CallInterfaceDescriptorData {
  public:
   CallInterfaceDescriptorData()
@@ -374,6 +373,11 @@ class FastNewContextDescriptor : public CallInterfaceDescriptor {
   DECLARE_DESCRIPTOR(FastNewContextDescriptor, CallInterfaceDescriptor)
 };
 
+class FastNewRestParameterDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(FastNewRestParameterDescriptor, CallInterfaceDescriptor)
+};
+
 
 class ToNumberDescriptor : public CallInterfaceDescriptor {
  public:
@@ -717,16 +721,6 @@ class ArgumentsAccessNewDescriptor : public CallInterfaceDescriptor {
 };
 
 
-class RestParamAccessDescriptor : public CallInterfaceDescriptor {
- public:
-  DECLARE_DESCRIPTOR_WITH_CUSTOM_FUNCTION_TYPE(RestParamAccessDescriptor,
-                                               CallInterfaceDescriptor)
-  static const Register parameter_count();
-  static const Register parameter_pointer();
-  static const Register rest_parameter_index();
-};
-
-
 class MathPowTaggedDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(MathPowTaggedDescriptor, CallInterfaceDescriptor)