Add Sema::ExtVectorDecls and Sema::ObjCCategoryImpls to the PCH file. Since...

Add Sema::ExtVectorDecls and Sema::ObjCCategoryImpls to the PCH file. Since these vectors are very, very rarely used and, when used in headers, and even when used are relatively small, we load them eagerly.

llvm-svn: 70240