add large array growth test

test/Makefile

@@ -9,7 +9,8 @@ CPPFLAGS += \
 
 EXECUTABLES := \
     offset \
-    mallinfo
+    mallinfo \
+    large_array_growth
 
 all: $(EXECUTABLES)
 

test/large_array_growth.c

@@ -0,0 +1,17 @@
+#include <stdlib.h>
+#include <string.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    void *p = NULL;
+    size_t size = 256 * 1024;
+
+    for (unsigned i = 0; i < 20; i++) {
+        p = realloc(p, size);
+        if (!p) {
+            return 1;
+        }
+        memset(p, 'a', size);
+        size = size * 3 / 2;
+    }
+}