Revert "ADT: Move ArrayRef comparison operators into the class"

This reverts commit r335839, because it breaks the MSVC build.

llvm-svn: 335844

llvm/include/llvm/ADT/ArrayRef.h

@@ -272,16 +272,6 @@ namespace llvm {
       return std::vector<T>(Data, Data+Length);
     }
 
-    /// @}
-    /// @name Comparison operators
-    /// @{
-
-    friend bool operator==(ArrayRef LHS, ArrayRef RHS) {
-      return LHS.equals(RHS);
-    }
-
-    friend bool operator!=(ArrayRef LHS, ArrayRef RHS) { return !(LHS == RHS); }
-
     /// @}
   };
 
@@ -520,6 +510,22 @@ namespace llvm {
     return MutableArrayRef<T>(data, length);
   }
 
+  /// @}
+  /// @name ArrayRef Comparison Operators
+  /// @{
+
+  template<typename T>
+  inline bool operator==(ArrayRef<T> LHS, ArrayRef<T> RHS) {
+    return LHS.equals(RHS);
+  }
+
+  template<typename T>
+  inline bool operator!=(ArrayRef<T> LHS, ArrayRef<T> RHS) {
+    return !(LHS == RHS);
+  }
+
+  /// @}
+
   // ArrayRefs can be treated like a POD type.
   template <typename T> struct isPodLike;
   template <typename T> struct isPodLike<ArrayRef<T>> {

llvm/unittests/ADT/ArrayRefTest.cpp

@@ -188,10 +188,6 @@ TEST(ArrayRefTest, Equals) {
   EXPECT_TRUE(AR1b.equals({3, 4, 5, 6}));
   EXPECT_FALSE(AR1b.equals({2, 3, 4, 5, 6}));
   EXPECT_FALSE(AR1b.equals({3, 4, 5, 6, 7}));
-
-  SmallVector<int, 8> V1{1, 2, 3, 4, 5, 6, 7, 8};
-  EXPECT_EQ(AR1, V1);
-  EXPECT_EQ(V1, AR1);
 }
 
 TEST(ArrayRefTest, EmptyEquals) {