[Compiler] Ensure we enter the correct context for compiler-dispatcher jobs.

src/compiler-dispatcher/compiler-dispatcher-job.h

Index: src/compiler-dispatcher/compiler-dispatcher-job.h
diff --git a/src/compiler-dispatcher/compiler-dispatcher-job.h b/src/compiler-dispatcher/compiler-dispatcher-job.h
index 94b2d784a8aa8dab2ae3b9a2a0f2e5cbba6629aa..1e26f1afe5842233f98b766b07cf6b8ec90b885e 100644
--- a/src/compiler-dispatcher/compiler-dispatcher-job.h
+++ b/src/compiler-dispatcher/compiler-dispatcher-job.h
@@ -60,6 +60,8 @@ class V8_EXPORT_PRIVATE CompilerDispatcherJob {
 
   CompileJobStatus status() const { return status_; }
 
+  Context* context() { return *context_; }
+
   // Returns true if this CompilerDispatcherJob was created for the given
   // function.
   bool IsAssociatedWith(Handle<SharedFunctionInfo> shared) const;
@@ -105,6 +107,7 @@ class V8_EXPORT_PRIVATE CompilerDispatcherJob {
   CompileJobStatus status_;
   Isolate* isolate_;
   CompilerDispatcherTracer* tracer_;
+  Handle<Context> context_;            // Global handle.
   Handle<SharedFunctionInfo> shared_;  // Global handle.
   Handle<String> source_;        // Global handle.
   Handle<String> wrapper_;       // Global handle.