Split HPhase for Lithium and Hydrogen using common CompilationPhase base.

src/lithium-allocator.h

Index: src/lithium-allocator.h
diff --git a/src/lithium-allocator.h b/src/lithium-allocator.h
index 552ebdd1dedb8b3aaa8fa6a161dedc4068efb5b2..afcf2dac37a186c6f7c474c2ac2ec24c65f69391 100644
--- a/src/lithium-allocator.h
+++ b/src/lithium-allocator.h
@@ -646,6 +646,20 @@ class LAllocator BASE_EMBEDDED {
 };
 
 
+class LAllocatorPhase : public CompilationPhase {
+ public:
+  LAllocatorPhase(const char* name, LAllocator* allocator)
+      : CompilationPhase(name, allocator->isolate(), allocator->zone()),
+        allocator_(allocator) { }
+  ~LAllocatorPhase();
+
+ private:
+  LAllocator* allocator_;
+
+  DISALLOW_COPY_AND_ASSIGN(LAllocatorPhase);
+};
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_LITHIUM_ALLOCATOR_H_