ObjectiveC: diagnose duplicate declaration of
private ivars in class extensions and class
@implementation. // rdar://14278560


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185025 91177308-0d34-0410-b5e6-96231b3b80d8
Sema: Small cleanup around TemplateParamListContext


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185029 91177308-0d34-0410-b5e6-96231b3b80d8