Add exec support for Linux including common support for POSIX.

llvm-svn: 192319
diff --git a/lldb/source/Plugins/Process/POSIX/POSIXThread.h b/lldb/source/Plugins/Process/POSIX/POSIXThread.h
index 66104c7..5490f1f 100644
--- a/lldb/source/Plugins/Process/POSIX/POSIXThread.h
+++ b/lldb/source/Plugins/Process/POSIX/POSIXThread.h
@@ -123,6 +123,7 @@
     void CrashNotify(const ProcessMessage &message);
     void ThreadNotify(const ProcessMessage &message);
     void ExitNotify(const ProcessMessage &message);
+    void ExecNotify(const ProcessMessage &message);
 
     lldb_private::Unwind *
     GetUnwinder();