Fix DCHECK(expr) errors when used as a stream in IR-included files
Fix DCHECK(expr) errors when used as a stream in IR-included files

DCHECK*() should evaluate to an ostream; we weren't doing this for the
wrapper we built for IR files.

Change-Id: I2c77bad428c677f0c71b45333f58f997ac26f402
Reviewed-on: http://gerrit.ent.cloudera.com:8080/177
Reviewed-by: Nong Li <99a5e5f8f5911755b88e0b536d46aafa102bed41@cloudera.com>
Tested-by: Henry Robinson <3eca10f30041813f045165784e24b5a950a6cc7e@cloudera.com>

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