Consumed analysis: Add param_typestate attribute, which specifies that
function parameters must be in a particular state.  Patch by
chris.wailes@gmail.com.  Reviewed by delesley@google.com.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@192934 91177308-0d34-0410-b5e6-96231b3b80d8