Fixes an issue where a signum => name mapping function has multiple case statements that define to the same integral value on my Linux (Ubuntu 12.04, x86_64).  It's for SIGIO and SIGPOLL.
In the case that they are both defined the same.
Patch by Todd Fiala (but typos are mine)



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@197221 91177308-0d34-0410-b5e6-96231b3b80d8