[driver] Don't generate diagnostics (i.e., preprocessed source) if reading 
from stdin.  This allows Eli and the like to continue with their debugging 
trickery without loss of limb (or car) on my part. :)



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@137906 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed