Reduce number of exported symbols

llvm-svn: 29220
diff --git a/llvm/lib/CodeGen/Passes.cpp b/llvm/lib/CodeGen/Passes.cpp
index a6ba120..435d6b5 100644
--- a/llvm/lib/CodeGen/Passes.cpp
+++ b/llvm/lib/CodeGen/Passes.cpp
@@ -20,7 +20,7 @@
 namespace {
   enum RegAllocName { simple, local, linearscan };
 
-  cl::opt<RegAllocName>
+  static cl::opt<RegAllocName>
   RegAlloc(
     "regalloc",
     cl::desc("Register allocator to use: (default = linearscan)"),