Fixes the X86 Base template.

src/IceCfg.h

Index: src/IceCfg.h
diff --git a/src/IceCfg.h b/src/IceCfg.h
index e96804cede2c792a43c430de958ffd2a0bcfa564..83c4ddd5730312ea37cfdb7f98f745c1f111ea75 100644
--- a/src/IceCfg.h
+++ b/src/IceCfg.h
@@ -104,6 +104,8 @@ public:
   // Manage Variables.
   // Create a new Variable with a particular type and an optional
   // name.  The Node argument is the node where the variable is defined.
+  // TODO(jpp): untemplate this with two separate methods: makeVariable and
+  // makeSpillVariable.
   template <typename T = Variable> T *makeVariable(Type Ty) {
     SizeT Index = Variables.size();
     T *Var = T::create(this, Ty, Index);