Merge commit '55d5ba905da0' from llvm.org/main into next

Author: git apple-llvm automerger

clang/lib/Sema/SemaChecking.cpp

@@ -16992,7 +16992,7 @@ class SequenceChecker : public ConstEvaluatedExprVisitor<SequenceChecker> {
     /// Have we issued a diagnostic for this object already?
     bool Diagnosed = false;
 
-    UsageInfo() = default;
+    UsageInfo();
   };
   using UsageInfoMap = llvm::SmallDenseMap<Object, UsageInfo, 16>;
 
@@ -17751,6 +17751,8 @@ class SequenceChecker : public ConstEvaluatedExprVisitor<SequenceChecker> {
   }
 };
 
+SequenceChecker::UsageInfo::UsageInfo() = default;
+
 } // namespace
 
 void Sema::CheckUnsequencedOperations(const Expr *E) {