Make several variable declarations static.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50696 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/LoopUnswitch.cpp

@@ -55,7 +55,7 @@ STATISTIC(NumTrivial , "Number of unswitches that are trivial");
 STATISTIC(NumSimplify, "Number of simplifications of unswitched code");
 
 namespace {
-  cl::opt<unsigned>
+  static cl::opt<unsigned>
   Threshold("loop-unswitch-threshold", cl::desc("Max loop size to unswitch"),
             cl::init(10), cl::Hidden);