Refactor Unix signals.

Summary:
- Consolidate Unix signals selection in UnixSignals.
- Make Unix signals available from platform.
- Add jSignalsInfo packet to retrieve Unix signals from remote platform.
- Get a copy of the platform signal for each remote process.
- Update SB API for signals.
- Update signal utility in test suite.

Reviewers: ovyalov, clayborg

Subscribers: chaoren, jingham, labath, emaste, tberghammer, lldb-commits

Differential Revision: http://reviews.llvm.org/D11094

llvm-svn: 242101
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerPlatform.h b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerPlatform.h
index 4124b04..5c01137 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerPlatform.h
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerPlatform.h
@@ -79,6 +79,9 @@
     PacketResult
     Handle_qC (StringExtractorGDBRemote &packet);
 
+    PacketResult
+    Handle_jSignalsInfo(StringExtractorGDBRemote &packet);
+
 private:
     bool
     DebugserverProcessReaped (lldb::pid_t pid);