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

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

Reviewed By: teemperor

Differential Revision: https://reviews.llvm.org/D84179

lldb/source/Commands/CommandObjectPlatform.cpp

@@ -1706,6 +1706,16 @@ public:
 
   ~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");

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

@@ -426,6 +426,9 @@ class CommandLineCompletionTestCase(TestBase):
         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()