Remove logic that decides whether to vectorize or not depending on O-levels

I have moved this logic into clang and opt.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188281 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/IPO/PassManagerBuilder.cpp b/lib/Transforms/IPO/PassManagerBuilder.cpp
index a6b3f4e..3883ea2 100644
--- a/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -195,7 +195,7 @@
   MPM.add(createLoopIdiomPass());             // Recognize idioms like memset.
   MPM.add(createLoopDeletionPass());          // Delete dead loops
 
-  if (!LateVectorize && LoopVectorize && OptLevel > 1 && SizeLevel < 2)
+  if (!LateVectorize && LoopVectorize)
       MPM.add(createLoopVectorizePass());
 
   if (!DisableUnrollLoops)