[runtime] TailCallRuntime and CallRuntime should use default argument counts

src/arm/macro-assembler-arm.cc

 // Copyright 2012 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.
 
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 2463 matching lines @@
 void MacroAssembler::CallExternalReference(const ExternalReference& ext,
                                            int num_arguments) {
   mov(r0, Operand(num_arguments));
   mov(r1, Operand(ext));
 
   CEntryStub stub(isolate(), 1);
   CallStub(&stub);
 }
 
 
-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(r0, Operand(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(r0, Operand(function->nargs));
+  }
+  JumpToExternalReference(ExternalReference(fid, isolate()));
 }
 
 
-void MacroAssembler::TailCallRuntime(Runtime::FunctionId fid,
-                                     int num_arguments) {
-  TailCallExternalReference(ExternalReference(fid, isolate()), num_arguments);
-}
-
-
 void MacroAssembler::JumpToExternalReference(const ExternalReference& builtin) {
 #if defined(__thumb__)
   // Thumb mode builtin.
   DCHECK((reinterpret_cast<intptr_t>(builtin.address()) & 1) == 1);
 #endif
   mov(r1, Operand(builtin));
   CEntryStub stub(isolate(), 1);
   Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
 }
 
@@ skipping 1087 matching lines @@
     }
   }
   if (mag.shift > 0) mov(result, Operand(result, ASR, mag.shift));
   add(result, result, Operand(dividend, LSR, 31));
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM