Hide the logic for command resolution for commands, aliases & user commands behind a single
interface so everybody does it the same way.  Add an "exact" lookup for internal uses.

Fix up a few little cases where we weren't reporting command lookup errors correctly.

Added "b" as an alias for "breakpoint" so it doesn't collide with "bt".



git-svn-id: https://llvm.org/svn/llvm-project/llvdb/trunk@107718 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/Interpreter/CommandObject.cpp b/source/Interpreter/CommandObject.cpp
index 7ee9137..88841c4 100644
--- a/source/Interpreter/CommandObject.cpp
+++ b/source/Interpreter/CommandObject.cpp
@@ -43,6 +43,7 @@
     m_cmd_help_short (),
     m_cmd_help_long (),
     m_cmd_syntax (),
+    m_is_alias (false),
     m_flags (flags)
 {
     if (help && help[0])