Array index computation dehoisting.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index 9083c1f8db9f9929bb80388f152d1576d9dc78ff..642a0a00385a94e730c7bba517f0466caa6bfc47 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -1199,6 +1199,7 @@ class LLoadKeyedFastElement: public LTemplateInstruction<1, 2, 0> {
 
   LOperand* elements() { return inputs_[0]; }
   LOperand* key() { return inputs_[1]; }
+  uint32_t additional_index() const { return hydrogen()->index_offset(); }
 };
 
 
@@ -1215,13 +1216,13 @@ class LLoadKeyedFastDoubleElement: public LTemplateInstruction<1, 2, 0> {
 
   LOperand* elements() { return inputs_[0]; }
   LOperand* key() { return inputs_[1]; }
+  uint32_t additional_index() const { return hydrogen()->index_offset(); }
 };
 
 
 class LLoadKeyedSpecializedArrayElement: public LTemplateInstruction<1, 2, 0> {
  public:
-  LLoadKeyedSpecializedArrayElement(LOperand* external_pointer,
-                                    LOperand* key) {
+  LLoadKeyedSpecializedArrayElement(LOperand* external_pointer, LOperand* key) {
     inputs_[0] = external_pointer;
     inputs_[1] = key;
   }
@@ -1235,6 +1236,7 @@ class LLoadKeyedSpecializedArrayElement: public LTemplateInstruction<1, 2, 0> {
   ElementsKind elements_kind() const {
     return hydrogen()->elements_kind();
   }
+  uint32_t additional_index() const { return hydrogen()->index_offset(); }
 };
 
 
@@ -1692,6 +1694,7 @@ class LStoreKeyedFastElement: public LTemplateInstruction<0, 3, 0> {
   LOperand* object() { return inputs_[0]; }
   LOperand* key() { return inputs_[1]; }
   LOperand* value() { return inputs_[2]; }
+  uint32_t additional_index() const { return hydrogen()->index_offset(); }
 };
 
 
@@ -1716,6 +1719,7 @@ class LStoreKeyedFastDoubleElement: public LTemplateInstruction<0, 3, 0> {
   LOperand* value() { return inputs_[2]; }
 
   bool NeedsCanonicalization() { return hydrogen()->NeedsCanonicalization(); }
+  uint32_t additional_index() const { return hydrogen()->index_offset(); }
 };
 
 
@@ -1739,6 +1743,7 @@ class LStoreKeyedSpecializedArrayElement: public LTemplateInstruction<0, 3, 0> {
   ElementsKind elements_kind() const {
     return hydrogen()->elements_kind();
   }
+  uint32_t additional_index() const { return hydrogen()->index_offset(); }
 };