cros-asan: Fix crash in chromeos asan bot.

When upgrade clang to clang 3.5, we need
__asan_stack_malloc_0 in the asan_stub.

BUG=None

Review URL: https://codereview.chromium.org/151183007

git-svn-id: http://src.chromium.org/svn/trunk/src/chrome/test/pyautolib@250806 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
diff --git a/asan_stub.c b/asan_stub.c
index 810a7eb..ae8c215 100644
--- a/asan_stub.c
+++ b/asan_stub.c
@@ -113,6 +113,7 @@
 typedef unsigned long long uptr;
 void __asan_poison_memory_region(void const volatile *addr, uptr size) { }
 void __asan_unpoison_memory_region(void const volatile *addr, uptr size) { }
+uptr __asan_stack_malloc_0(uptr size, uptr real_stack) {}
 uptr __asan_stack_malloc_1(uptr size, uptr real_stack) {}
 uptr __asan_stack_malloc_2(uptr size, uptr real_stack) {}
 uptr __asan_stack_malloc_3(uptr size, uptr real_stack) {}
@@ -123,6 +124,7 @@
 uptr __asan_stack_malloc_8(uptr size, uptr real_stack) {}
 uptr __asan_stack_malloc_9(uptr size, uptr real_stack) {}
 uptr __asan_stack_malloc_10(uptr size, uptr real_stack) {}
+void  __asan_stack_free_0(uptr ptr, uptr size, uptr real_stack) {}
 void  __asan_stack_free_1(uptr ptr, uptr size, uptr real_stack) {}
 void  __asan_stack_free_2(uptr ptr, uptr size, uptr real_stack) {}
 void  __asan_stack_free_3(uptr ptr, uptr size, uptr real_stack) {}