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[DWARFYAML][test] Use 'CHECK-NEXT:' to make checkers stricter. NFC.

Authored by Higuoxing on Sep 18 2020, 5:18 AM.

Description

[DWARFYAML][test] Use 'CHECK-NEXT:' to make checkers stricter. NFC.

This patch makes checkers stricter so that we are able to avoid
some potential problems earlier.

Reviewed By: jhenderson, MaskRay

Differential Revision: https://reviews.llvm.org/D87876