Merge pull request #40865 from etcwilde/ewilde/remove-constexpr-if

Remove constexpr-if from runtime

Author: etcwilde

include/swift/Runtime/Concurrent.h

@@ -881,7 +881,7 @@ struct ConcurrentReadableHashMap {
     auto *newElements = ElementStorage::allocate(newCapacity);
 
     if (elements) {
-      if constexpr (std::is_trivially_copyable<ElemTy>::value) {
+      if (std::is_trivially_copyable<ElemTy>::value) {
         memcpy(newElements->data(), elements->data(),
                elementCount * sizeof(ElemTy));
       } else {