Suppress an annoying "unused variable" warning caused by bug 17897.
Suppress an annoying "unused variable" warning caused by bug 17897.

Clang says that "flow" is unused when building LLD. This patch suppresses it.

Differential Revision: http://llvm-reviews.chandlerc.com/D2573

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@199922 91177308-0d34-0410-b5e6-96231b3b80d8

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