Merge commit '2a9afdb79377' from llvm.org/main into next

Author: git apple-llvm automerger

clang/include/clang/Sema/ParsedAttr.h

@@ -694,7 +694,7 @@ class AttributePool {
   friend class AttributeFactory;
   friend class ParsedAttributes;
   AttributeFactory &Factory;
-  llvm::SmallVector<ParsedAttr *> Attrs;
+  llvm::SmallVector<ParsedAttr *, 2> Attrs;
 
   void *allocate(size_t size) {
     return Factory.allocate(size);
@@ -824,7 +824,7 @@ class AttributePool {
 
 class ParsedAttributesView {
   friend class AttributePool;
-  using VecTy = llvm::SmallVector<ParsedAttr *>;
+  using VecTy = llvm::SmallVector<ParsedAttr *, 2>;
   using SizeType = decltype(std::declval<VecTy>().size());
 
 public: