Teach PCH that ASTContext is optional.  Move -parse-noop and -Eonly (so far)
processing to after PCH is loaded.  -Eonly and -parse-noop are close to working
with PCH now but are not quite there yet.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70257 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed