A64: Synchronize with r18084.

src/a64/macro-assembler-a64.h

Index: src/a64/macro-assembler-a64.h
diff --git a/src/a64/macro-assembler-a64.h b/src/a64/macro-assembler-a64.h
index b3047eee6cdce3b5fa149bbb10c1d7c1b56773dd..b8db68a7daab946348cea6bdce7eb71444fcd4a9 100644
--- a/src/a64/macro-assembler-a64.h
+++ b/src/a64/macro-assembler-a64.h
@@ -956,11 +956,13 @@ class MacroAssembler : public Assembler {
                    int num_arguments,
                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
 
-  void CallRuntime(Runtime::FunctionId id, int num_arguments) {
-    CallRuntime(Runtime::FunctionForId(id), num_arguments);
+  void CallRuntime(Runtime::FunctionId id,
+                   int num_arguments,
+                   SaveFPRegsMode save_doubles = kDontSaveFPRegs) {
+    CallRuntime(Runtime::FunctionForId(id), num_arguments, save_doubles);
   }
 
-  // TODO(all): Why does this variant save FP regs by default?
+  // TODO(all): Why does this variant save FP regs unconditionally?
   void CallRuntimeSaveDoubles(Runtime::FunctionId id) {
     const Runtime::Function* function = Runtime::FunctionForId(id);
     CallRuntime(function, function->nargs, kSaveFPRegs);