Merge pull request dotnet/coreclr#23858 from sandreenko/fixOptPrepareTreeToReplacement
authorSergey Andreenko <seandree@microsoft.com>
Wed, 10 Apr 2019 22:15:12 +0000 (15:15 -0700)
committerGitHub <noreply@github.com>
Wed, 10 Apr 2019 22:15:12 +0000 (15:15 -0700)
Clean optVNConstantPropOnTree.

Commit migrated from https://github.com/dotnet/coreclr/commit/37ab0d569c13924cb6f1dab04f8b13d79e073baf


Trivial merge