BoundsCheck should be extended to support array_bounds_checks_elimination

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
===================================================================
--- src/hydrogen-instructions.h	(revision 11854)
+++ src/hydrogen-instructions.h	(working copy)
@@ -2700,7 +2700,9 @@
 
 class HBoundsCheck: public HTemplateInstruction<2> {
  public:
-  HBoundsCheck(HValue* index, HValue* length) {
+  HBoundsCheck(HValue* index, HValue* length)
+      : lower_offset_(0),
+        upper_offset_(0) {
     SetOperandAt(0, index);
     SetOperandAt(1, length);
     set_representation(Representation::Integer32());
@@ -2718,8 +2720,18 @@
 
   DECLARE_CONCRETE_INSTRUCTION(BoundsCheck)
 
+  void set_offset(int32_t lower_offset, int32_t upper_offset) {
+    lower_offset_ = lower_offset;
+    upper_offset_ = upper_offset;
+  }
+
+  int32_t lower_offset() { return lower_offset_; }
+  int32_t upper_offset() { return upper_offset_; }
+
  protected:
   virtual bool DataEquals(HValue* other) { return true; }
+  int32_t lower_offset_;
+  int32_t upper_offset_;
 };