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[SelectionDAG] Expand ADD/SUBCARRY

Authored by leonardchan on May 8 2019, 6:17 PM.

Description

[SelectionDAG] Expand ADD/SUBCARRY

This patch allows for expansion of ADDCARRY and SUBCARRY when the target does not support it.

Differential Revision: https://reviews.llvm.org/D61411

llvm-svn: 360303