Simplify dispatch in optimizing compile stubs.

src/runtime/runtime-compiler.cc

Index: src/runtime/runtime-compiler.cc
diff --git a/src/runtime/runtime-compiler.cc b/src/runtime/runtime-compiler.cc
index 8790da05e39a1b62b50da1d22a1c229d02c79684..04d28e20381539ef32c96c1954cc4411c158db43 100644
--- a/src/runtime/runtime-compiler.cc
+++ b/src/runtime/runtime-compiler.cc
@@ -44,17 +44,13 @@ RUNTIME_FUNCTION(Runtime_CompileLazy) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_CompileOptimized) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
-  CONVERT_BOOLEAN_ARG_CHECKED(concurrent, 1);
+namespace {
 
+Object* CompileOptimized(Isolate* isolate, Handle<JSFunction> function,
+                         Compiler::ConcurrencyMode mode) {
   StackLimitCheck check(isolate);
   if (check.JsHasOverflowed(1 * KB)) return isolate->StackOverflow();
 
-  Compiler::ConcurrencyMode mode =
-      concurrent ? Compiler::CONCURRENT : Compiler::NOT_CONCURRENT;
   Handle<Code> code;
   Handle<Code> unoptimized(function->shared()->code());
   if (Compiler::GetOptimizedCode(function, unoptimized, mode).ToHandle(&code)) {
@@ -80,6 +76,24 @@ RUNTIME_FUNCTION(Runtime_CompileOptimized) {
   return function->code();
 }
 
+}  // namespace
+
+
+RUNTIME_FUNCTION(Runtime_CompileOptimized_Concurrent) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
+  return CompileOptimized(isolate, function, Compiler::CONCURRENT);
+}
+
+
+RUNTIME_FUNCTION(Runtime_CompileOptimized_NotConcurrent) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
+  return CompileOptimized(isolate, function, Compiler::NOT_CONCURRENT);
+}
+
 
 RUNTIME_FUNCTION(Runtime_NotifyStubFailure) {
   HandleScope scope(isolate);