[PCH/preamble] Make sure that if the preamble/PCH was serialized with errors...
[PCH/preamble] Make sure that if the preamble/PCH was serialized with errors that we set diagnostic engine state appropriately. Otherwise there can be a crash with CFG analysis warnings doing work on invalid AST. Fixes crash of rdar://26224134 llvm-svn: 275313
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