[compiler] Add baseline tier to compilation pipeline.

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 756dd9aa890dc777a3beec17161e67a12315aeae..c8fc9e8351227dae93070166bfe7b604085ee387 100644
--- a/src/runtime/runtime-compiler.cc
+++ b/src/runtime/runtime-compiler.cc
@@ -19,7 +19,7 @@ namespace internal {
 
 RUNTIME_FUNCTION(Runtime_CompileLazy) {
   HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
+  DCHECK_EQ(1, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
 
 #ifdef DEBUG
@@ -39,10 +39,22 @@ RUNTIME_FUNCTION(Runtime_CompileLazy) {
   return function->code();
 }
 
+RUNTIME_FUNCTION(Runtime_CompileBaseline) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(1, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
+  StackLimitCheck check(isolate);
+  if (check.JsHasOverflowed(1 * KB)) return isolate->StackOverflow();
+  if (!Compiler::CompileBaseline(function)) {
+    return isolate->heap()->exception();
+  }
+  DCHECK(function->is_compiled());
+  return function->code();
+}
 
 RUNTIME_FUNCTION(Runtime_CompileOptimized_Concurrent) {
   HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
+  DCHECK_EQ(1, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
   StackLimitCheck check(isolate);
   if (check.JsHasOverflowed(1 * KB)) return isolate->StackOverflow();
@@ -56,7 +68,7 @@ RUNTIME_FUNCTION(Runtime_CompileOptimized_Concurrent) {
 
 RUNTIME_FUNCTION(Runtime_CompileOptimized_NotConcurrent) {
   HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
+  DCHECK_EQ(1, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
   StackLimitCheck check(isolate);
   if (check.JsHasOverflowed(1 * KB)) return isolate->StackOverflow();