[clang][Interp][NFC] Remove unneeded CheckRange call

This doesn't do anything with the current tests and is unnecessary in
general.

Author: tbaederr

clang/lib/AST/Interp/Interp.h

@@ -1538,9 +1538,6 @@ inline bool Memcpy(InterpState &S, CodePtr OpPC) {
 template <class T, ArithOp Op>
 bool OffsetHelper(InterpState &S, CodePtr OpPC, const T &Offset,
                   const Pointer &Ptr) {
-  if (!CheckRange(S, OpPC, Ptr, CSK_ArrayToPointer))
-    return false;
-
   // A zero offset does not change the pointer.
   if (Offset.isZero()) {
     S.Stk.push<Pointer>(Ptr);