Revert "[CodeGenPrepare] Move sign/zero extensions near loads using type promotion."

This reverts commit r224351. It causes assertion failures when building
ICU.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224397 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86ISelLowering.cpp

@@ -1689,7 +1689,7 @@ void X86TargetLowering::resetOperationActions() {
 
   // Predictable cmov don't hurt on atom because it's in-order.
   PredictableSelectIsExpensive = !Subtarget->isAtom();
-  EnableExtLdPromotion = true;
+
   setPrefFunctionAlignment(4); // 2^4 bytes.
 
   verifyIntrinsicTables();