[Batch mode] <rdar://40167848> Merge pull request #16526 from davidungar/compilation-failed #16596
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[Batch Mode] Emit a non-specific error for all primaries lacking specific errors when a batch has errors.
Explanation: In batch mode an error in any file stops compilation of all (primary) files. Issue a nonspecific error to any primary file that has no other error/
Scope of issue: User experience when using batch mode in, e.g. Xcode.
Origination: Batch mode/Xcode interaction.
Risk: May be confusing, but less confusing than no error.
Reviewed by: Jordan Rose
Testing: Normal regression tests.
Radar: rdar://40167848
Resolves SR-NNNN.