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[FileCheck] Add docs for --allow-empty

Authored by sameerarora101 on Jul 13 2020, 7:39 AM.

Description

[FileCheck] Add docs for --allow-empty

This diff adds documentation for allow-empty flag under FileCheck
docs.

Reviewed by jhenderson, smeenai, thopre

Differential Revision: https://reviews.llvm.org/D83682

Details