[llvm] r208238 - avoid segfaulting

[Sebastian Pop]

Philip Reames wrote:
> Test case?  Motivation?

Several buildbots were failing yesterday because of an earlier patch I have
committed: this patch fixes the failing testcases.

http://lab.llvm.org:8011/builders/llvm-hexagon-elf/builds/7584
http://lab.llvm.org:8011/builders/llvm-clang-lld-x86_64-centos-6.5/builds/4382
http://lab.llvm.org:8011/builders/llvm-mips-linux/builds/8617

and several others.

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