[HWASan] add test for hwasan_handle_longjmp ignore logic (#83359)

Author: fmayer

compiler-rt/test/hwasan/TestCases/longjmp-out-of-range.c

@@ -0,0 +1,20 @@
+// RUN: %clang_hwasan -O0 %s -o %t && %run %t 2>&1 | FileCheck %s
+
+// REQUIRES: pointer-tagging
+#include <assert.h>
+#include <sanitizer/hwasan_interface.h>
+#include <stdlib.h>
+
+__attribute__((noinline)) int f(void *caller_frame) {
+  int z = 0;
+  int *volatile p = &z;
+  // Tag of local is never zero.
+  assert(__hwasan_tag_pointer(p, 0) != p);
+  __hwasan_handle_longjmp(NULL);
+  return p[0];
+}
+
+int main() {
+  return f(__builtin_frame_address(0));
+  // CHECK: HWASan is ignoring requested __hwasan_handle_longjmp:
+}