Revert "Implement in-heap backing store for typed arrays."

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 61b49653c7f68136f31aa505456a5db8093dfed2..f337e9f0de071c119aad69a765e1c4ef5add51d2 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -1540,12 +1540,6 @@ class LLoadKeyed V8_FINAL : public LTemplateInstruction<1, 2, 0> {
   bool is_external() const {
     return hydrogen()->is_external();
   }
-  bool is_fixed_typed_array() const {
-    return hydrogen()->is_fixed_typed_array();
-  }
-  bool is_typed_elements() const {
-    return is_external() || is_fixed_typed_array();
-  }
   LOperand* elements() { return inputs_[0]; }
   LOperand* key() { return inputs_[1]; }
   virtual void PrintDataTo(StringStream* stream) V8_OVERRIDE;
@@ -2173,12 +2167,6 @@ class LStoreKeyed V8_FINAL : public LTemplateInstruction<0, 3, 0> {
   }
 
   bool is_external() const { return hydrogen()->is_external(); }
-  bool is_fixed_typed_array() const {
-    return hydrogen()->is_fixed_typed_array();
-  }
-  bool is_typed_elements() const {
-    return is_external() || is_fixed_typed_array();
-  }
   LOperand* elements() { return inputs_[0]; }
   LOperand* key() { return inputs_[1]; }
   LOperand* value() { return inputs_[2]; }