[PATCH] D11847: [BasicAA] Fix zext & sext handling

[Nicholas White via llvm-commits]

Hi - sorry I haven't had time to address Hal's review comments yet,
and thanks for the additional test case Quentin. This patch (or as you
pointed out, series of edits to the sext / zext code) is only intended
to fix outstanding bugs, not add any new functionality. It'd be good
if this gets into 3.7 but the bugs it fixes are in the 3.6 release and
aren't causing too much pain - and touching this part of the codebase
has a lot of downstream consequences. Thanks -

Nick