Merging r326429:
Merging r326429:

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r326429 | d0k | 2018-03-01 03:31:44 -0800 (Thu, 01 Mar 2018) | 1 line

[SCCP] Fix unused variable warning in release builds.
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git-svn-id: aad6896a0674cbe2af7806761e473047ca8ef14a@331722 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm