Don't inline full VMState's constructor/destructor.

src/log.h

Index: src/log.h
diff --git a/src/log.h b/src/log.h
index 1f6e60e1a67b6425bb20db56fe473d614824ba20..9013f15e3682ebd640f2b409acdab98c3b34a274 100644
--- a/src/log.h
+++ b/src/log.h
@@ -95,12 +95,16 @@ class VMState BASE_EMBEDDED {
   inline ~VMState();
 
   StateTag state() { return state_; }
+
   Address external_callback() { return external_callback_; }
   void set_external_callback(Address external_callback) {
     external_callback_ = external_callback;
   }
 
  private:
+  void Initialize(StateTag state);
+  void Destroy();
+
   bool disabled_;
   StateTag state_;
   VMState* previous_;