AArch64: add comment missed out from earlier patch.
authorTim Northover <tnorthover@apple.com>
Fri, 17 Jul 2015 03:31:50 +0000 (03:31 +0000)
committerTim Northover <tnorthover@apple.com>
Fri, 17 Jul 2015 03:31:50 +0000 (03:31 +0000)
commitb974e0babeb068c9d991c28d4e1d4f33303594e0
tree47bf5765ea679f8681be82d1e89492316a069544
parentc8fe2bf3a4f4887b461f164f042403f304df50a9
AArch64: add comment missed out from earlier patch.

Helps explain some of the background behind this bit of code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242503 91177308-0d34-0410-b5e6-96231b3b80d8
lib/Target/AArch64/AArch64ISelDAGToDAG.cpp