Limit size of dehoistable array indices

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index e336c49d1df195653fc75aca87d4fb6eaf3b4b0c..6b92d5baa987abc7c47c76c88a6e2b88a14f24d6 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -6141,6 +6141,7 @@ class ArrayInstructionInterface {
   virtual HValue* GetKey() = 0;
   virtual void SetKey(HValue* key) = 0;
   virtual void SetIndexOffset(uint32_t index_offset) = 0;
+  virtual int MaxIndexOffsetBits() = 0;
   virtual bool IsDehoisted() = 0;
   virtual void SetDehoisted(bool is_dehoisted) = 0;
   virtual ~ArrayInstructionInterface() { };
@@ -6180,6 +6181,9 @@ class HLoadKeyed V8_FINAL
   void SetIndexOffset(uint32_t index_offset) {
     bit_field_ = IndexOffsetField::update(bit_field_, index_offset);
   }
+  virtual int MaxIndexOffsetBits() {
+    return kBitsForIndexOffset;
+  }
   HValue* GetKey() { return key(); }
   void SetKey(HValue* key) { SetOperandAt(1, key); }
   bool IsDehoisted() { return IsDehoistedField::decode(bit_field_); }
@@ -6566,6 +6570,9 @@ class HStoreKeyed V8_FINAL
   ElementsKind elements_kind() const { return elements_kind_; }
   uint32_t index_offset() { return index_offset_; }
   void SetIndexOffset(uint32_t index_offset) { index_offset_ = index_offset; }
+  virtual int MaxIndexOffsetBits() {
+    return 31 - ElementsKindToShiftSize(elements_kind_);
+  }
   HValue* GetKey() { return key(); }
   void SetKey(HValue* key) { SetOperandAt(1, key); }
   bool IsDehoisted() { return is_dehoisted_; }