Move the optlevel check to the frontend.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187628 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/IPO/PassManagerBuilder.cpp b/lib/Transforms/IPO/PassManagerBuilder.cpp
index 5363c91..6355204 100644
--- a/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -217,7 +217,7 @@
   addExtensionsToPM(EP_ScalarOptimizerLate, MPM);
 
   if (!LateVectorize) {
-    if (SLPVectorize && OptLevel > 2)
+    if (SLPVectorize)
       MPM.add(createSLPVectorizerPass());   // Vectorize parallel scalar chains.
 
     if (BBVectorize) {