ExecutionEngine: honor optimization level

It was getting ignored after r144788.

Also fix an accidental implicit cast from the OptLevel enum
to an optional bool argument. MSVC warned on this, but gcc
didn't.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145633 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/TargetSelect.cpp

@@ -32,6 +32,7 @@ TargetMachine *EngineBuilder::selectTarget(Module *Mod,
                               const SmallVectorImpl<std::string>& MAttrs,
                               Reloc::Model RM,
                               CodeModel::Model CM,
+                              CodeGenOpt::Level OL,
                               std::string *ErrorStr) {
   Triple TheTriple(Mod->getTargetTriple());
   if (TheTriple.getTriple().empty())
@@ -87,7 +88,7 @@ TargetMachine *EngineBuilder::selectTarget(Module *Mod,
   // Allocate a target...
   TargetMachine *Target = TheTarget->createTargetMachine(TheTriple.getTriple(),
                                                          MCPU, FeaturesStr,
-                                                         RM, CM);
+                                                         RM, CM, OL);
   assert(Target && "Could not allocate target machine!");
   return Target;
 }