[runtime] TailCallRuntime and CallRuntime should use default argument counts

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index 0aaea1daa0b7b89db7521637292af44d0557f054..3210fefb76966b09319fc00262df93b52e162a80 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -2481,20 +2481,17 @@ void MacroAssembler::CallExternalReference(const ExternalReference& ext,
 }
 
 
-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,
-                                     int num_arguments) {
-  TailCallExternalReference(ExternalReference(fid, isolate()), num_arguments);
+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()));
 }