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from e873939bd3e Silence "unused variable" warning in LiveIntervals.cpp afte [...] new 583ccd4384c [FileCheck] Add CHECK-EMPTY directive for checking for blank lines

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Summary of changes: docs/CommandGuide/FileCheck.rst | 19 ++++++++++++++ test/FileCheck/check-empty-tag.txt | 45 +++++++++++++++++++++++++++++++ utils/FileCheck/FileCheck.cpp | 54 +++++++++++++++++++++++++++++++------- 3 files changed, 108 insertions(+), 10 deletions(-) create mode 100644 test/FileCheck/check-empty-tag.txt