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
diff --git a/lib/ExecutionEngine/ExecutionEngine.cpp b/lib/ExecutionEngine/ExecutionEngine.cpp
index 525877b..d94f546 100644
--- a/lib/ExecutionEngine/ExecutionEngine.cpp
+++ b/lib/ExecutionEngine/ExecutionEngine.cpp
@@ -420,7 +420,7 @@
 ExecutionEngine *ExecutionEngine::createJIT(Module *M,
                                             std::string *ErrorStr,
                                             JITMemoryManager *JMM,
-                                            CodeGenOpt::Level OptLevel,
+                                            CodeGenOpt::Level OL,
                                             bool GVsWithCode,
                                             Reloc::Model RM,
                                             CodeModel::Model CMM) {
@@ -437,10 +437,10 @@
   SmallVector<std::string, 1> MAttrs;
 
   TargetMachine *TM =
-    EngineBuilder::selectTarget(M, MArch, MCPU, MAttrs, RM, CMM, ErrorStr);
+    EngineBuilder::selectTarget(M, MArch, MCPU, MAttrs, RM, CMM, OL, ErrorStr);
   if (!TM || (ErrorStr && ErrorStr->length() > 0)) return 0;
 
-  return ExecutionEngine::JITCtor(M, ErrorStr, JMM, OptLevel, GVsWithCode, TM);
+  return ExecutionEngine::JITCtor(M, ErrorStr, JMM, OL, GVsWithCode, TM);
 }
 
 ExecutionEngine *EngineBuilder::create() {
@@ -467,7 +467,7 @@
   if (WhichEngine & EngineKind::JIT) {
     if (TargetMachine *TM = EngineBuilder::selectTarget(M, MArch, MCPU, MAttrs,
                                                         RelocModel, CMModel,
-                                                        ErrorStr)) {
+                                                        OptLevel, ErrorStr)) {
       if (UseMCJIT && ExecutionEngine::MCJITCtor) {
         ExecutionEngine *EE =
           ExecutionEngine::MCJITCtor(M, ErrorStr, JMM, OptLevel,