add another test for invalid small region frees

test/simple-memory-corruption/Makefile

@@ -12,6 +12,7 @@ all: \
     invalid_free_protected \
     invalid_free_unprotected \
     invalid_free_small_region \
+    invalid_free_small_region_far \
     uninitialized_free \
     uninitialized_realloc \
     uninitialized_malloc_usable_size \

test/simple-memory-corruption/invalid_free_small_region_far.c

@@ -0,0 +1,12 @@
+#include <stdlib.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    char *p = malloc(16);
+    if (!p) {
+        return 1;
+    }
+    char *q = p + 1024 * 1024 * 1024;
+    free(q);
+    return 0;
+}