Merging r226616:

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r226616 | adrian | 2015-01-20 14:37:25 -0800 (Tue, 20 Jan 2015) | 2 lines

DebugLocs without a scope should fail the verification.
Follow-up to r226588.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_36@228985 91177308-0d34-0410-b5e6-96231b3b80d8