<rdar://problem/15045059>

One of the things that dynamic typing affects is the count of children a type has
Clear out the flag that makes us blindly believe the children count when a dynamic type change is detected



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@193663 91177308-0d34-0410-b5e6-96231b3b80d8