[analyzer] Display cast kinds in program point dumps.

Because cast expressions have their own hierarchy, it's extremely useful
to have some information about what kind of casts are we dealing with.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@375185 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed