Consumed Analysis:  Change callable_when so that it can take a list of states
that a function can be called in.  This reduced the total number of annotations
needed and makes writing more complicated behaviour less burdensome.
Patch by chriswails@gmail.com.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@191983 91177308-0d34-0410-b5e6-96231b3b80d8