Keep CodeGenPrepare from preserving the domtree.

CGP modifies the domtree in some cases, so saying that it preserves the
domtree is a lie. We'll be able to selectively preserve it with the new
pass manager.

Differential Revision: http://reviews.llvm.org/D16893


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264099 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed