[lldb] tab completion for `platform target-install`

[MrHate]

Summary

1. Applied the common completion eDiskFileCompletion to the first argument of the command platform target-install;
2. Added a related test case.

[teemperor]

LGTM.

lldb/source/Commands/CommandObjectPlatform.cpp

public:
   CommandObjectPlatformInstall(CommandInterpreter &interpreter)
       : CommandObjectParsed(
             interpreter, "platform target-install",
             "Install a target (bundle or executable file) to the remote end.",
             "platform target-install <local-thing> <remote-sandbox>", 0) {}
 
   ~CommandObjectPlatformInstall() override = default;
 
+  void
+  HandleArgumentCompletion(CompletionRequest &request,
+                           OptionElementVector &opt_element_vector) override {
+    if (request.GetCursorIndex())
+      return;
+    CommandCompletions::InvokeCommonCompletionCallbacks(
+        GetCommandInterpreter(), CommandCompletions::eDiskFileCompletion,
+        request, nullptr);
+  }
+
   bool DoExecute(Args &args, CommandReturnObject &result) override {
     if (args.GetArgumentCount() != 2) {
       result.AppendError("platform target-install takes two arguments");
       result.SetStatus(eReturnStatusFailed);
       return false;
     }
     // TODO: move the bulk of this code over to the platform itself
     FileSpec src(args.GetArgumentAtIndex(0));

lldb/test/API/functionalities/completion/TestCompletion.py

def test_frame_select(self):
         lldbutil.run_to_source_breakpoint(self, '// Break here', self.main_source_spec)
 
         self.complete_from_to('frame select ', ['0'])
     
     def test_frame_recognizer_delete(self):
         self.runCmd("frame recognizer add -l py_class -s module_name -n recognizer_name")
         self.check_completion_with_desc('frame recognizer delete ', [['0', 'py_class, module module_name, symbol recognizer_name']])
 
+    def test_platform_install_local_file(self):
+        self.complete_from_to('platform target-install main.cp', 'platform target-install main.cpp')
+
     @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24489")
     def test_symbol_name(self):
         self.build()
         self.dbg.CreateTarget(self.getBuildArtifact("a.out"))
         self.complete_from_to('breakpoint set -n Fo',
                               'breakpoint set -n Foo::Bar(int,\\ int)',
                               turn_off_re_match=True)
         # No completion for Qu because the candidate is