Revert "GVN fix, preventing loads hoisting above stores to the same field when HObjectAccess's repr…

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index fce5d681a95cc1afb133b91a4ae3b347ad66e9e2..f1720f444247d83635c84d00a99cf2457ee0022e 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -6202,14 +6202,7 @@ class HObjectAccess V8_FINAL {
   void PrintTo(StringStream* stream) const;
 
   inline bool Equals(HObjectAccess that) const {
-    return value_ == that.value_;
-  }
-
-  // Returns true if |this| access refers to the same field as |that|, which
-  // means that both have same |offset| and |portion| values.
-  inline bool SameField(HObjectAccess that) const {
-    uint32_t mask = PortionField::kMask | OffsetField::kMask;
-    return (value_ & mask) == (that.value_ & mask);
+    return value_ == that.value_;  // portion and offset must match
   }
 
  protected: