LangRef: mention MSan's problem with speculative conditional branches.

LangRef: mention MSan's problem with speculative conditional branches.

Summary:
This short blurb aims to disallow optimizations like we had to revert
(under MSan) in
  https://reviews.llvm.org/D21165
  https://bugs.llvm.org/show_bug.cgi?id=28054
  https://reviews.llvm.org/D67205

Reviewers: vitalybuka, efriedma

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67244

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@371461 91177308-0d34-0410-b5e6-96231b3b80d8