Fix name of nested type in comment to match code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200570 91177308-0d34-0410-b5e6-96231b3b80d8
Add support for DW_FORM_flag and DW_FORM_flag_present to the DIE hashing
algorithm. Sink the 'A' + Attribute hash into each form so we don't
have to check valid forms before deciding whether or not we're going
to hash which will let the default be to return without doing anything.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200571 91177308-0d34-0410-b5e6-96231b3b80d8