CPP Output: Do not emit an enter file marker for the main file.

 - This diverges from gcc, and confuses tools (like dtrace) which track # line
   markers as a way to determine which content is in the context of the main
   file.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@168128 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed