When using a precompiled preamble, save the diagnostics produced when
creating the preamble and "replay" them when reusing the
preamble. Also, fix a thinko in the copying of the preamble when
building the precompiled preamble.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@110061 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed