Move checking m_dummy_target to after raw-plus-option parsing. (#170888)

CommandObjectBreakpointAddPattern is a raw command. I was adjusting the
patch for changes to handle the dummy target changes done while the
patch was in review, and I copied the lines to the beginning of the
DoExecute, but in the case of raw commands, you have to do the option
parsing by hand, and this was before the parsing was done so the state
wasn't determined yet.

Author: jimingham

lldb/source/Commands/CommandObjectBreakpoint.cpp

@@ -1255,8 +1255,6 @@ class CommandObjectBreakpointAddPattern : public CommandObjectRaw {
                  CommandReturnObject &result) override {
     const bool internal = false;
     ExecutionContext exe_ctx = GetCommandInterpreter().GetExecutionContext();
-    Target &target =
-        m_dummy_options.m_use_dummy ? GetDummyTarget() : GetTarget();
     m_all_options.NotifyOptionParsingStarting(&exe_ctx);
 
     if (command.empty()) {
@@ -1279,6 +1277,9 @@ class CommandObjectBreakpointAddPattern : public CommandObjectRaw {
     }
     printf("Pattern: '%s'\n", pattern.str().c_str());
 
+    Target &target =
+        m_dummy_options.m_use_dummy ? GetDummyTarget() : GetTarget();
+
     BreakpointSP bp_sp;
     const size_t num_files = m_options.m_files.GetSize();