Merge commit 'a2b31109458a' from llvm.org/main into next

Author: git apple-llvm automerger

clang/include/clang/Sema/DeclSpec.h

@@ -1989,7 +1989,7 @@ class Declarator {
   /// parsed.  This is pushed from the identifier out, which means that element
   /// #0 will be the most closely bound to the identifier, and
   /// DeclTypeInfo.back() will be the least closely bound.
-  SmallVector<DeclaratorChunk, 8> DeclTypeInfo;
+  SmallVector<DeclaratorChunk, 4> DeclTypeInfo;
 
   /// InvalidType - Set by Sema::GetTypeForDeclarator().
   LLVM_PREFERRED_TYPE(bool)