tree e283338b36954c69f967b75ebbcf732b65e17c86
parent 1adc215ddcadcfaaa07a8e93f48a8f62c4561afe
author Pete Cooper <peter_cooper@apple.com> 1333412926 +0000
committer Pete Cooper <peter_cooper@apple.com> 1333412926 +0000

Fixes to r153903.  Added missing explanation of behaviour when the VirtRegMap is NULL.  Also changed it in this case to just avoid updating the map, but live ranges or intervals will still get updated and created

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153914 91177308-0d34-0410-b5e6-96231b3b80d8