[Batch mode] <rdar://40225790> Merge pull request #16583 from davidungar/batch-remark #16599
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[Batch Mode] Output a remark from the driver when in batch mode
Explanation: Output a remark when using batch mode, so user can tell.
Scope of issue: Alleviates confusion when trying batch mode.
Origination: Batch mode + quasi-pid fix (#16546)
Risk: Minimal. Xcode ignores driver output in stderr.
Reviewed by: Jordan Rose
Testing: Normal regression tests.
Radar: rdar://40225790
Resolves SR-NNNN.