Prevent __rust_begin_short_backtrace frames from being tail-call optimised away

src/test/ui/panics/issue-47429-short-backtraces.rs

@@ -0,0 +1,18 @@
+// Regression test for #47429: short backtraces were not terminating correctly
+
+// compile-flags: -O
+// run-fail
+// check-run-results
+// exec-env:RUST_BACKTRACE=1
+
+// ignore-msvc see #62897 and `backtrace-debuginfo.rs` test
+// ignore-android FIXME #17520
+// ignore-cloudabi spawning processes is not supported
+// ignore-openbsd no support for libbacktrace without filename
+// ignore-wasm no panic or subprocess support
+// ignore-emscripten no panic or subprocess support
+// ignore-sgx no subprocess support
+
+fn main() {
+    panic!()
+}

src/test/ui/panics/issue-47429-short-backtraces.run.stderr

@@ -0,0 +1,5 @@
+thread 'main' panicked at 'explicit panic', $DIR/issue-47429-short-backtraces.rs:17:5
+stack backtrace:
+   0: std::panicking::begin_panic
+   1: issue_47429_short_backtraces::main
+note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.