Revert the C++20 changes that is breaking OSS.

Summary: Revert D71624494

Reviewed By: byahn0996

Differential Revision: D71847677

fbshipit-source-id: 837872c4e7d92721728e684db7469053f4004323

Author: pbhandar2

cachelib/allocator/tests/MM2QTest.cpp

@@ -336,7 +336,7 @@ TEST_F(MM2QTest, SegmentStress) {
         return;
       }
       auto n = folly::Random::rand32() % nNodes;
-      while (inLru.contains(n)) {
+      while (inLru.count(n) != 0) {
         n = folly::Random::rand32() % nNodes;
       }
       c.add(*nodes[n]);
@@ -355,7 +355,7 @@ TEST_F(MM2QTest, SegmentStress) {
         n = folly::Random::rand32() % nNodes;
       }
       c.remove(*nodes[n]);
-      assert(inLru.contains(n));
+      assert(inLru.count(n) != 0);
       inLru.erase(n);
     };
 

cachelib/allocator/tests/MMLruTest.cpp

@@ -419,7 +419,7 @@ TEST_F(MMLruTest, InsertionPointStress) {
         return;
       }
       auto n = folly::Random::rand32() % nNodes;
-      while (inLru.contains(n)) {
+      while (inLru.count(n) != 0) {
         n = folly::Random::rand32() % nNodes;
       }
       c.add(*nodes[n]);
@@ -442,7 +442,7 @@ TEST_F(MMLruTest, InsertionPointStress) {
         n = folly::Random::rand32() % nNodes;
       }
       c.remove(*nodes[n]);
-      assert(inLru.contains(n));
+      assert(inLru.count(n) != 0);
       inLru.erase(n);
 #ifdef PRINT_DEBUG_STR
       XLOG(INFO) << "remove " << n;

cachelib/allocator/tests/MMTinyLFUTest.cpp

@@ -321,7 +321,7 @@ TEST_F(MMTinyLFUTest, SegmentStress) {
         return;
       }
       auto n = folly::Random::rand32() % nNodes;
-      while (inLru.contains(n)) {
+      while (inLru.count(n) != 0) {
         n = folly::Random::rand32() % nNodes;
       }
       c.add(*nodes[n]);
@@ -340,7 +340,7 @@ TEST_F(MMTinyLFUTest, SegmentStress) {
         n = folly::Random::rand32() % nNodes;
       }
       c.remove(*nodes[n]);
-      assert(inLru.contains(n));
+      assert(inLru.count(n) != 0);
       inLru.erase(n);
     };