Introduce more appropriate assertion mechanism

rust-analyzer is a long-running program, so we *should* handle assertion
failures.

See also https://www.sqlite.org/assert.html.

crates/rust-analyzer/src/bin/main.rs

@@ -70,6 +70,11 @@ fn setup_logging(log_file: Option<PathBuf>) -> Result<()> {
     tracing_setup::setup_tracing()?;
 
     profile::init();
+
+    if !cfg!(debug_assertions) {
+        stdx::set_assert_hook(|loc, args| log::error!("assertion failed at {}: {}", loc, args));
+    }
+
     Ok(())
 }