[ubsan] Fix parameter type mismatch ubsan for DestroyWatch callback.

Fixes https://github.com/dart-lang/sdk/issues/62365
TEST=ci

Change-Id: I70232a592c3382b1833eeffa499e713ef2cadbc2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/471342
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Alexander Aprelev <aam@google.com>

runtime/bin/file_system_watcher.h

@@ -58,7 +58,7 @@ class FileSystemWatcher {
   static Dart_Handle ReadEvents(intptr_t id, intptr_t path_id);
 
 #if defined(DART_HOST_OS_MACOS) || defined(DART_HOST_OS_WINDOWS)
-  static void DestroyWatch(intptr_t path_id);
+  static void DestroyWatch(void* ptr);
 #endif
 
   static void set_delayed_filewatch_callback(bool value) {

runtime/bin/file_system_watcher_macos.cc

@@ -326,7 +326,8 @@ void FileSystemWatcher::UnwatchPath(intptr_t id, intptr_t path_id) {
   Node::Unwatch(reinterpret_cast<Node*>(path_id));
 }
 
-void FileSystemWatcher::DestroyWatch(intptr_t path_id) {
+void FileSystemWatcher::DestroyWatch(void* ptr) {
+  intptr_t path_id = reinterpret_cast<intptr_t>(ptr);
   FileSystemWatcher::UnwatchPath(0, path_id);
 }
 
@@ -363,7 +364,7 @@ bool FileSystemWatcher::IsSupported() {
 
 void FileSystemWatcher::UnwatchPath(intptr_t id, intptr_t path_id) {}
 
-void FileSystemWatcher::DestroyWatch(intptr_t path_id) {}
+void FileSystemWatcher::DestroyWatch(void* ptr) {}
 
 void FileSystemWatcher::InitOnce() {}
 

runtime/bin/file_system_watcher_win.cc

@@ -62,7 +62,8 @@ intptr_t FileSystemWatcher::WatchPath(intptr_t id,
   return reinterpret_cast<intptr_t>(handle);
 }
 
-void FileSystemWatcher::DestroyWatch(intptr_t path_id) {
+void FileSystemWatcher::DestroyWatch(void* ptr) {
+  intptr_t path_id = reinterpret_cast<intptr_t>(ptr);
   FileSystemWatcher::UnwatchPath(0, path_id);
 }