Georgii Rymar 65a2de7e6c [FileCheck] - Fix the false positive when -implicit-check-not is used with an unknown -check-prefix.
Imagine we have the following invocation:

`FileCheck -check-prefix=UNKNOWN-PREFIX -implicit-check-not=something`

When the check prefix does not exist it does not fail.
This patch fixes the issue.

Differential revision: https://reviews.llvm.org/D78024
2020-04-16 15:00:50 +03:00
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