fix sometimes incorrect line numbers in -frewrite-includes mode (pr#14795)

Every #include is surrounded by #if 0 in order to comment it out, which adds
lines. That is fixed up right after, but that all can be inside #if part
that is not processed, so fix up also after every end of a conditional part.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@186763 91177308-0d34-0410-b5e6-96231b3b80d8