Revert "[ADT] Enable set_difference() to be used on StringSet"

This reverts commit 0bddef79019a23ab14fcdb27028e55e484674c88, it was
causing ASan failures on the sanitizer bots:
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fast/builds/32800

llvm-svn: 362823

3 files changed, 15 insertions, 44 deletions

diff --git a/llvm/unittests/ADT/CMakeLists.txt b/llvm/unittests/ADT/CMakeLists.txt
index 676ce181871..d2a35273389 100644
--- a/llvm/unittests/ADT/CMakeLists.txt
+++ b/llvm/unittests/ADT/CMakeLists.txt
@@ -65,7 +65,6 @@ add_llvm_unittest(ADTTests
   StringExtrasTest.cpp
   StringMapTest.cpp
   StringRefTest.cpp
-  StringSetTest.cpp
   StringSwitchTest.cpp
   TinyPtrVectorTest.cpp
   TripleTest.cpp
diff --git a/llvm/unittests/ADT/StringMapTest.cpp b/llvm/unittests/ADT/StringMapTest.cpp
index 4038d4d3d2f..841b5153935 100644
--- a/llvm/unittests/ADT/StringMapTest.cpp
+++ b/llvm/unittests/ADT/StringMapTest.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringSet.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Support/DataTypes.h"
 #include "gtest/gtest.h"
@@ -283,6 +284,20 @@ TEST_F(StringMapTest, IterMapKeys) {
   EXPECT_EQ(Expected, Keys);
 }
 
+TEST_F(StringMapTest, IterSetKeys) {
+  StringSet<> Set;
+  Set.insert("A");
+  Set.insert("B");
+  Set.insert("C");
+  Set.insert("D");
+
+  auto Keys = to_vector<4>(Set.keys());
+  llvm::sort(Keys);
+
+  SmallVector<StringRef, 4> Expected = {"A", "B", "C", "D"};
+  EXPECT_EQ(Expected, Keys);
+}
+
 // Create a non-default constructable value
 struct StringMapTestStruct {
   StringMapTestStruct(int i) : i(i) {}
diff --git a/llvm/unittests/ADT/StringSetTest.cpp b/llvm/unittests/ADT/StringSetTest.cpp
deleted file mode 100644
index 822fe52f191..00000000000
--- a/llvm/unittests/ADT/StringSetTest.cpp
+++ /dev/null
@@ -1,43 +0,0 @@
-//===- llvm/unittest/ADT/StringSetTest.cpp - StringSet unit tests ----------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/ADT/StringSet.h"
-#include "gtest/gtest.h"
-using namespace llvm;
-
-namespace {
-
-// Test fixture
-class StringSetTest : public testing::Test {};
-
-TEST_F(StringSetTest, IterSetKeys) {
-  StringSet<> Set;
-  Set.insert("A");
-  Set.insert("B");
-  Set.insert("C");
-  Set.insert("D");
-
-  auto Keys = to_vector<4>(Set.keys());
-  llvm::sort(Keys);
-
-  SmallVector<StringRef, 4> Expected = {"A", "B", "C", "D"};
-  EXPECT_EQ(Expected, Keys);
-}
-
-TEST_F(StringSetTest, InsertAndCountStringMapEntry) {
-  // Test insert(StringMapEntry) and count(StringMapEntry)
-  // which are required for set_difference(StringSet, StringSet).
-  StringSet<> Set;
-  StringMapEntry<StringRef> Element(1, "A");
-  Set.insert(Element);
-  size_t Count = Set.count(Element);
-  size_t Expected = 1;
-  EXPECT_EQ(Expected, Count);
-}
-
-} // end anonymous namespace