Temporarily Revert "[DataLayout] Fix occurrences that size and range of pointers are assumed to be the same."

This reverts commit 5f6208778ff92567c57d7c1e2e740c284d7e69a5.

This caused failures in Transforms/PhaseOrdering/scev-custom-dl.ll
const: Assertion `getBitWidth() == CR.getBitWidth() && "ConstantRange types don't agree!"' failed.
diff --git a/llvm/lib/Analysis/Loads.cpp b/llvm/lib/Analysis/Loads.cpp
index a7d07c0..3f03d53 100644
--- a/llvm/lib/Analysis/Loads.cpp
+++ b/llvm/lib/Analysis/Loads.cpp
@@ -150,7 +150,7 @@
 
   // Require ABI alignment for loads without alignment specification
   const Align Alignment = DL.getValueOrABITypeAlignment(MA, Ty);
-  APInt AccessSize(DL.getPointerTypeSizeInBits(V->getType()),
+  APInt AccessSize(DL.getIndexTypeSizeInBits(V->getType()),
                    DL.getTypeStoreSize(Ty));
   return isDereferenceableAndAlignedPointer(V, Alignment, AccessSize, DL, CtxI,
                                             DT);