Make several variable declarations static.

llvm-svn: 50696
diff --git a/llvm/lib/Transforms/IPO/LoopExtractor.cpp b/llvm/lib/Transforms/IPO/LoopExtractor.cpp
index a2aa4e3..54fc442 100644
--- a/llvm/lib/Transforms/IPO/LoopExtractor.cpp
+++ b/llvm/lib/Transforms/IPO/LoopExtractor.cpp
@@ -149,7 +149,7 @@
 namespace {
   // BlockFile - A file which contains a list of blocks that should not be
   // extracted.
-  cl::opt<std::string>
+  static cl::opt<std::string>
   BlockFile("extract-blocks-file", cl::value_desc("filename"),
             cl::desc("A file containing list of basic blocks to not extract"),
             cl::Hidden);