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[UpdateCCTestChecks] Fix --replace-value-regex across RUN lines

Authored by jdenny on Jun 21 2021, 12:53 PM.

Description

[UpdateCCTestChecks] Fix --replace-value-regex across RUN lines

Without this patch, llvm/utils/update_cc_test_checks.py fails to
perform --replace-value-regex replacements when two RUN lines
produce the same output and use the same single FileCheck prefix. The
problem is that replacements in a RUN line's output are not performed
until after comparing against previous RUN lines' output, where
replacements have already been performed. This patch fixes that.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D104566