Make precompiled headers work with -E. When we're only preprocessing
(with -E), we turn the PCH include into an implicit include of the
file from which the PCH file was generated.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@71534 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed