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[InstCombine] rename test file to better describe the fold; NFC

Authored by spatel on Sep 14 2018, 11:12 AM.

Description

[InstCombine] rename test file to better describe the fold; NFC

The folds are not limited to zext, and the real goal is width
reduction of a math op. D52075 is proposing to extend this to
subtracts.

llvm-svn: 342254

Details

Committed
spatelSep 14 2018, 11:12 AM
Parents
rG5a9462e42a16: [InstCombine] remove unnecessary target constraints for tests; NFC
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