Adding untrusted crash dump / stack trace tests.

tests/untrusted_crash_dump/untrusted_crash_dump_test.c

Index: tests/untrusted_crash_dump/untrusted_crash_dump_test.c
diff --git a/tests/untrusted_crash_dump/untrusted_crash_dump_test.c b/tests/untrusted_crash_dump/untrusted_crash_dump_test.c
new file mode 100644
index 0000000000000000000000000000000000000000..da61b98789d397a7c00dc7819aed42dfde9b7355
--- /dev/null
+++ b/tests/untrusted_crash_dump/untrusted_crash_dump_test.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2012 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "native_client/src/untrusted/crash_dump/untrusted_crash_dump.h"
+
+
+void CallMe(void (*func)(int), int);
+
+
+/*
+ * Calling thru several layers of functions, varying arguments to yield

[Mark Seaborn, 2012/02/17 01:13:40]

'through'

[bradn, 2012/02/17 01:28:02]

Done.

Though Noah Webster is rolling in his grave:
http://en.wikipedia.org/wiki/English-language_spelling_reform

+ * differently size stack frames.

[Mark Seaborn, 2012/02/17 01:13:40]

'differently sized' or 'different size'

[bradn, 2012/02/17 01:28:02]

Done.

+ */
+
+void layer5(int x, int y) {
+  *(volatile int *) x = y;
+}
+
+void layer4(int x) {
+  layer5(x, 1);
+}
+
+void layer3(int a, int b, int c) {
+  CallMe(layer4, a + b + c);
+}
+
+void layer2(int i, int j) {
+  layer3(i, j, 7);
+}
+
+void layer1(int s, int t) {
+  int *junk = (int*)alloca(sizeof(int)* 1234);
+  junk[0] = s + 5;
+  layer2(junk[0], t + 1);
+}
+
+int main() {
+  NaClCrashDumpInit();
+
+  layer1(2, 9);
+
+  return 1;
+}