Attempt to fix the expression parser after r214119

__INT?_TYPE__ is now explicitly, so adding an explicit 'signed'
specifier causes errors.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@214233 91177308-0d34-0410-b5e6-96231b3b80d8
Add $vAttach support to llgs.

Also adds a new test case for vAttach;{pid} for llgs and debugserver.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@214236 91177308-0d34-0410-b5e6-96231b3b80d8