[Dwarf] Complete the list of type tags.

[Dwarf] Complete the list of type tags.

An incorrect verification error revealed that the list of type tags was
incomplete. This patch adds the missing types by adding a tag kind to
the Dwarf.def file, which is used by the `isType` function.

A test was added for the original verification error.

Differential revision: https://reviews.llvm.org/D65914

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@368718 91177308-0d34-0410-b5e6-96231b3b80d8