Implement dependency analysis for the precompiled preamble. If any of
the files in the precompiled preamble have changed since it was build,
force the preamble to be rebuilt.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@109937 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed