[lldb] Use Target references instead of pointers in CommandObject (NFC)

The GetTarget helper returns a Target reference so there's reason to
convert it to a pointer and check its validity.

Author: JDevlieghere

lldb/source/Commands/CommandObjectBreakpointCommand.cpp

@@ -548,9 +548,9 @@ class CommandObjectBreakpointCommandList : public CommandObjectParsed {
 
 protected:
   void DoExecute(Args &command, CommandReturnObject &result) override {
-    Target *target = &GetTarget();
+    Target &target = GetTarget();
 
-    const BreakpointList &breakpoints = target->GetBreakpointList();
+    const BreakpointList &breakpoints = target.GetBreakpointList();
     size_t num_breakpoints = breakpoints.GetSize();
 
     if (num_breakpoints == 0) {
@@ -566,7 +566,7 @@ class CommandObjectBreakpointCommandList : public CommandObjectParsed {
 
     BreakpointIDList valid_bp_ids;
     CommandObjectMultiwordBreakpoint::VerifyBreakpointOrLocationIDs(
-        command, target, result, &valid_bp_ids,
+        command, &target, result, &valid_bp_ids,
         BreakpointName::Permissions::PermissionKinds::listPerm);
 
     if (result.Succeeded()) {
@@ -575,7 +575,7 @@ class CommandObjectBreakpointCommandList : public CommandObjectParsed {
         BreakpointID cur_bp_id = valid_bp_ids.GetBreakpointIDAtIndex(i);
         if (cur_bp_id.GetBreakpointID() != LLDB_INVALID_BREAK_ID) {
           Breakpoint *bp =
-              target->GetBreakpointByID(cur_bp_id.GetBreakpointID()).get();
+              target.GetBreakpointByID(cur_bp_id.GetBreakpointID()).get();
 
           if (bp) {
             BreakpointLocationSP bp_loc_sp;

lldb/source/Commands/CommandObjectDisassemble.cpp

@@ -439,10 +439,10 @@ CommandObjectDisassemble::GetRangesForSelectedMode(
 
 void CommandObjectDisassemble::DoExecute(Args &command,
                                          CommandReturnObject &result) {
-  Target *target = &GetTarget();
+  Target &target = GetTarget();
 
   if (!m_options.arch.IsValid())
-    m_options.arch = target->GetArchitecture();
+    m_options.arch = target.GetArchitecture();
 
   if (!m_options.arch.IsValid()) {
     result.AppendError(
@@ -535,7 +535,7 @@ void CommandObjectDisassemble::DoExecute(Args &command,
       } else {
         result.AppendErrorWithFormat(
             "Failed to disassemble memory at 0x%8.8" PRIx64 ".\n",
-            cur_range.GetBaseAddress().GetLoadAddress(target));
+            cur_range.GetBaseAddress().GetLoadAddress(&target));
       }
     }
     if (print_sc_header)