Less aggressive polling when concurrently compiling for OSR.

src/compiler.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 68 matching lines @@
   Scope* global_scope() const { return global_scope_; }
   Handle<Code> code() const { return code_; }
   Handle<JSFunction> closure() const { return closure_; }
   Handle<SharedFunctionInfo> shared_info() const { return shared_info_; }
   Handle<Script> script() const { return script_; }
   HydrogenCodeStub* code_stub() const {return code_stub_; }
   v8::Extension* extension() const { return extension_; }
   ScriptDataImpl* pre_parse_data() const { return pre_parse_data_; }
   Handle<Context> context() const { return context_; }
   BailoutId osr_ast_id() const { return osr_ast_id_; }
+  uint32_t osr_pc_offset() const { return osr_pc_offset_; }
   int opt_count() const { return opt_count_; }
   int num_parameters() const;
   int num_heap_slots() const;
   Code::Flags flags() const;
 
   void MarkAsEval() {
     ASSERT(!is_lazy());
     flags_ |= IsEval::encode(true);
   }
   void MarkAsGlobal() {
@@ skipping 426 matching lines @@
   Status last_status() const { return last_status_; }
   CompilationInfo* info() const { return info_; }
   Isolate* isolate() const { return info()->isolate(); }
 
   MUST_USE_RESULT Status AbortOptimization() {
     info_->AbortOptimization();
     info_->shared_info()->DisableOptimization(info_->bailout_reason());
     return SetLastStatus(BAILED_OUT);
   }
 
+  void WaitForInstall() {
+    ASSERT(!info_->osr_ast_id().IsNone());
+    awaiting_install_ = true;
+  }
+
+  bool IsWaitingForInstall() { return awaiting_install_; }
+
  private:
   CompilationInfo* info_;
   HOptimizedGraphBuilder* graph_builder_;
   HGraph* graph_;
   LChunk* chunk_;
   TimeDelta time_taken_to_create_graph_;
   TimeDelta time_taken_to_optimize_;
   TimeDelta time_taken_to_codegen_;
   Status last_status_;
+  bool awaiting_install_;
 
   MUST_USE_RESULT Status SetLastStatus(Status status) {
     last_status_ = status;
     return last_status_;
   }
   void RecordOptimizationStats();
 
   struct Timer {
     Timer(OptimizingCompiler* compiler, TimeDelta* location)
         : compiler_(compiler),
@@ skipping 103 matching lines @@
   unsigned info_zone_start_allocation_size_;
   ElapsedTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_