Split HPhase for Lithium and Hydrogen using common CompilationPhase base.

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index 779acbc35166df282b87bf8023e18e2e3256a2c7..53d0690f96a3b6fe79b0022c79744a74c5a498c9 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -633,6 +633,29 @@ class Compiler : public AllStatic {
 };
 
 
+class CompilationPhase BASE_EMBEDDED {
+ public:
+  CompilationPhase(const char* name, Isolate* isolate, Zone* zone);
+  ~CompilationPhase();
+
+ protected:
+  bool ShouldProduceTraceOutput() const;
+
+  const char* name() const { return name_; }
+  Isolate* isolate() const { return isolate_; }
+  Zone* zone() const { return zone_scope_.zone(); }
+
+ private:
+  const char* name_;
+  Isolate* isolate_;
+  ZoneScope zone_scope_;
+  unsigned start_allocation_size_;
+  int64_t start_ticks_;
+
+  DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
+};
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_