Add a basic compiler dispatcher

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 3f9457e560f6cfe5deb0044922a0d42265e9e21a..7d5289e2e8622a28bfa3da4282fe78bb8a25883f 100644
--- a/src/runtime/runtime-compiler.cc
+++ b/src/runtime/runtime-compiler.cc
@@ -6,6 +6,7 @@
 
 #include "src/arguments.h"
 #include "src/asmjs/asm-js.h"
+#include "src/compiler-dispatcher/compiler-dispatcher.h"
 #include "src/compiler-dispatcher/optimizing-compile-dispatcher.h"
 #include "src/compiler.h"
 #include "src/deoptimizer.h"
@@ -34,7 +35,13 @@ RUNTIME_FUNCTION(Runtime_CompileLazy) {
 
   StackLimitCheck check(isolate);
   if (check.JsHasOverflowed(1 * KB)) return isolate->StackOverflow();
-  if (!Compiler::Compile(function, Compiler::KEEP_EXCEPTION)) {
+  CompilerDispatcher* dispatcher = isolate->compiler_dispatcher();
+  Handle<SharedFunctionInfo> shared(function->shared(), isolate);
+  if (dispatcher->IsEnqueued(shared)) {
+    if (!dispatcher->FinishNow(shared)) {
+      return isolate->heap()->exception();
+    }
+  } else if (!Compiler::Compile(function, Compiler::KEEP_EXCEPTION)) {
     return isolate->heap()->exception();
   }
   DCHECK(function->is_compiled());