Ahmed Bougacha a09ff59cc2 [CodeGen] Don't require AA in TwoAddress at -O0. ...

This is a follow-up to r302611, which moved an -O0 computation of DT
from SDAGISel to TwoAddress.

Don't use it here either, and avoid computing it completely.  The only
use was forwarding the analysis as an optional argument to utility
functions.

Differential Revision: https://reviews.llvm.org/D32766

llvm-svn: 302612

2017-05-10 00:56:00 +00:00

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