Roman Lebedev aea042e978 [NFC][InstSimplify] Add a note to PHI CSE tests that they are all negative tests ...

As discussed in https://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20200824/824235.html
even though it seems worthwhile doing so in InstSimplify,
we really can't do that there, because the other PHI wouldn't be
def-reachable from the original PHI.

2020-08-29 13:13:06 +03:00

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