Revert "Protect some assertions with NDEBUG rather than DEBUG()."

This reverts r265092, because it breaks CodeGen/X86/deopt-intrinsic.ll.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265093 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed