Fix a bug where global variable can be reported as local.

There was an error in ORing mask which is used for getting a list of variables.
Previously, these constants were unnamed, and possible it become the reason of this
bug. Also added test case for -stack-list-local and -stack-list_arguments.

Patch from Ilia K <ki.stfu@gmail.com>.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@223674 91177308-0d34-0410-b5e6-96231b3b80d8