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[docs] Document pattern of using CHECK-SAME to skip irrelevant lines

Authored by rupprecht on Aug 4 2020, 4:23 PM.

Description

[docs] Document pattern of using CHECK-SAME to skip irrelevant lines

This came up during the review for D67656. It's nice but also subtle, so documenting it as an idiom will make tests easier to understand.

Reviewed By: probinson

Differential Revision: https://reviews.llvm.org/D68061