Simplify the check when to perform loop invariant code motion.

src/hydrogen.h

Index: src/hydrogen.h
===================================================================
--- src/hydrogen.h	(revision 8241)
+++ src/hydrogen.h	(working copy)
@@ -143,6 +143,9 @@
   bool IsInlineReturnTarget() const { return is_inline_return_target_; }
   void MarkAsInlineReturnTarget() { is_inline_return_target_ = true; }
 
+  bool IsDeoptimizing() const { return is_deoptimizing_; }
+  void MarkAsDeoptimizing() { is_deoptimizing_ = true; }
+
   inline Zone* zone();
 
 #ifdef DEBUG
@@ -175,6 +178,7 @@
   ZoneList<int> deleted_phis_;
   HBasicBlock* parent_loop_header_;
   bool is_inline_return_target_;
+  bool is_deoptimizing_;
 };