[PATCH] [Msan] Fix the backtrace.cc tests to build and pass on FreeBSD

[Evgeniy Stepanov]

LGTM


================
Comment at: test/msan/backtrace.cc:20
@@ -19,3 +19,3 @@
   for (int i = 0; i < sz; ++i)
-    printf("%d\n", strlen(s[i]));
+    printf("%d\n", (int)strlen(s[i]));
 }
----------------
You could also use %zu.

http://reviews.llvm.org/D9221

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