Improve demangler to compile with MSVC.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@205769 91177308-0d34-0410-b5e6-96231b3b80d8
Added i686 architecture (ArchSpec::Core::eCore_x86_32_i686).

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@205770 91177308-0d34-0410-b5e6-96231b3b80d8