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/Host/common/Host.cpp b/lldb/source/Host/common/Host.cpp
index 20d6355..94c78a0 100644
--- a/lldb/source/Host/common/Host.cpp
+++ b/lldb/source/Host/common/Host.cpp
@@ -1070,13 +1070,9 @@
 
 #endif
 
-#if !defined (__linux__) && !defined (__FreeBSD__) && !defined(__FreeBSD_kernel__) && !defined (__NetBSD__)
-
-const lldb_private::UnixSignalsSP&
-Host::GetUnixSignals ()
+const UnixSignalsSP &
+Host::GetUnixSignals()
 {
-    static UnixSignalsSP s_unix_signals_sp (new UnixSignals ());
+    static const auto s_unix_signals_sp = UnixSignals::Create(HostInfo::GetArchitecture());
     return s_unix_signals_sp;
 }
-
-#endif