Add a basic compiler dispatcher

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index eca069c576ae009c9772acfe2a70ad65446b0d45..822b50f216be8d9d7b7c6485c1a91cd48f67ca44 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -46,7 +46,7 @@ class CodeRange;
 class CodeStubDescriptor;
 class CodeTracer;
 class CompilationCache;
-class CompilerDispatcherTracer;
+class CompilerDispatcher;
 class CompilationStatistics;
 class ContextSlotCache;
 class Counters;
@@ -1161,8 +1161,8 @@ class Isolate {
 
   AccountingAllocator* allocator() { return allocator_; }
 
-  CompilerDispatcherTracer* compiler_dispatcher_tracer() const {
-    return compiler_dispatcher_tracer_;
+  CompilerDispatcher* compiler_dispatcher() const {
+    return compiler_dispatcher_;
   }
 
   // Clear all optimized code stored in native contexts.
@@ -1397,7 +1397,7 @@ class Isolate {
 
   interpreter::Interpreter* interpreter_;
 
-  CompilerDispatcherTracer* compiler_dispatcher_tracer_;
+  CompilerDispatcher* compiler_dispatcher_;
 
   typedef std::pair<InterruptCallback, void*> InterruptEntry;
   std::queue<InterruptEntry> api_interrupts_queue_;