Instead of passing in an unsigned value for the optimization level, use an enum,
which better identifies what the optimization is doing. And is more flexible for
future uses.

llvm-svn: 70440
diff --git a/llvm/lib/ExecutionEngine/Interpreter/Interpreter.cpp b/llvm/lib/ExecutionEngine/Interpreter/Interpreter.cpp
index c05eeac..ded65d5 100644
--- a/llvm/lib/ExecutionEngine/Interpreter/Interpreter.cpp
+++ b/llvm/lib/ExecutionEngine/Interpreter/Interpreter.cpp
@@ -37,7 +37,7 @@
 /// create - Create a new interpreter object.  This can never fail.
 ///
 ExecutionEngine *Interpreter::create(ModuleProvider *MP, std::string* ErrStr,
-                                     unsigned OptLevel /*unused*/) {
+                                     CodeGenOpt::Level OptLevel /*unused*/) {
   // Tell this ModuleProvide to materialize and release the module
   if (!MP->materializeModule(ErrStr))
     // We got an error, just return 0