Fix a warning

llvm-svn: 17431
diff --git a/llvm/lib/Target/X86/X86TargetMachine.cpp b/llvm/lib/Target/X86/X86TargetMachine.cpp
index 62440ee..26ffc19 100644
--- a/llvm/lib/Target/X86/X86TargetMachine.cpp
+++ b/llvm/lib/Target/X86/X86TargetMachine.cpp
@@ -31,7 +31,8 @@
 /// in a library unless there are references into the library.  In particular,
 /// it seems that it is not possible to get things to work on Win32 without
 /// this.  Though it is unused, do not remove it.
-extern "C" int X86TargetMachineModule = 0;
+extern "C" int X86TargetMachineModule;
+int X86TargetMachineModule = 0;
 
 namespace {
   cl::opt<bool> NoSSAPeephole("disable-ssa-peephole", cl::init(true),