Add comment about a gotcha I ran across while touching this code.
authorDavid Blaikie <dblaikie@gmail.com>
Wed, 14 Jan 2015 19:59:18 +0000 (19:59 +0000)
committerDavid Blaikie <dblaikie@gmail.com>
Wed, 14 Jan 2015 19:59:18 +0000 (19:59 +0000)
commit4ade012dd08c80ef14e899de4455d16df5fa732d
treed4e5a7bd13d9947525ec239c6455d3370402edfe
parent9e4a11f46c4611662d28cec1f2c008ad0ed24023
Add comment about a gotcha I ran across while touching this code.

I haven't looked closely at exactly why the side effect is required, but
this seems better than not mentioning it at all.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226030 91177308-0d34-0410-b5e6-96231b3b80d8
include/llvm/Support/GenericDomTreeConstruction.h