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[InstCombine] add nnan tests; NFC

Authored by spatel on Sep 5 2017, 2:20 PM.

Description

[InstCombine] add nnan tests; NFC

As suggested in D37427, we could have a value tracking function and folds that use
it to simplify these cases.

llvm-svn: 312578

Details

Committed
spatelSep 5 2017, 2:20 PM
Parents
rG2ea27186b4ba: Use raw_string_ostream::str to get a result string.
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