Silence compile warning by removing unused SourceMgr member

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@198083 91177308-0d34-0410-b5e6-96231b3b80d8
Reduce indentation of some VFTableBuilder code.

No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@198085 91177308-0d34-0410-b5e6-96231b3b80d8
Move MS header search test inputs to Inputs/

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@198086 91177308-0d34-0410-b5e6-96231b3b80d8