[runtime] TailCallRuntime and CallRuntime should use default argument counts

src/arm64/macro-assembler-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 1709 matching lines @@
   // You can't call a builtin without a valid frame.
   DCHECK(flag == JUMP_FUNCTION || has_frame());
 
   // Fake a parameter count to avoid emitting code to do the check.
   ParameterCount expected(0);
   LoadNativeContextSlot(native_context_index, x1);
   InvokeFunctionCode(x1, no_reg, expected, expected, flag, call_wrapper);
 }
 
 
-void MacroAssembler::TailCallExternalReference(const ExternalReference& ext,
-                                               int num_arguments) {
-  // TODO(1236192): Most runtime routines don't need the number of
-  // arguments passed in because it is constant. At some point we
-  // should remove this need and make the runtime routine entry code
-  // smarter.
-  Mov(x0, num_arguments);
-  JumpToExternalReference(ext);
+void MacroAssembler::TailCallRuntime(Runtime::FunctionId fid) {
+  const Runtime::Function* function = Runtime::FunctionForId(fid);
+  DCHECK_EQ(1, function->result_size);
+  if (function->nargs >= 0) {
+    // TODO(1236192): Most runtime routines don't need the number of
+    // arguments passed in because it is constant. At some point we
+    // should remove this need and make the runtime routine entry code
+    // smarter.
+    Mov(x0, function->nargs);
+  }
+  JumpToExternalReference(ExternalReference(fid, isolate()));
 }
 
 
-void MacroAssembler::TailCallRuntime(Runtime::FunctionId fid,
-                                     int num_arguments) {
-  TailCallExternalReference(ExternalReference(fid, isolate()), num_arguments);
-}
-
-
 void MacroAssembler::InitializeNewString(Register string,
                                          Register length,
                                          Heap::RootListIndex map_index,
                                          Register scratch1,
                                          Register scratch2) {
   DCHECK(!AreAliased(string, length, scratch1, scratch2));
   LoadRoot(scratch2, map_index);
   SmiTag(scratch1, length);
   Str(scratch2, FieldMemOperand(string, HeapObject::kMapOffset));
 
@@ skipping 3111 matching lines @@
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64