Fixes PR14811: Crash when formatting some macros

A preprocessor directive cannot be started while we're parsing one.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171635 91177308-0d34-0410-b5e6-96231b3b80d8
Make checking for 'protected' access in debug info more legible.

Based on code review feedback for r171604 from Chandler Carruth &
Eric Christopher. Enabled by improvements to LLVM made in r171636.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171637 91177308-0d34-0410-b5e6-96231b3b80d8
Fixes a breakage in dejagnu++ test suite where it included
<objc/Protocol.h>. Caused by my recent changes for 
various builtin declarations of objc_msgSendSuper
variety. // rdar://12489098


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171638 91177308-0d34-0410-b5e6-96231b3b80d8