Revert "[InstCombineCalls] Use isKnownNonNullAt() to check nullness of passing arguments at callsite"

This reverts commit r247356.

Breaks test/Transforms/InstCombine/pr8547.ll with:

Wrong types for attribute: byval inalloca nest noalias nocapture nonnull readnone readonly sret dereferenceable(1) dereferenceable_or_null(1)
  %call = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 nonnull %conv2) #0
LLVM ERROR: Broken function found, compilation aborted!

From: Mehdi Amini <[email protected]>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247371 91177308-0d34-0410-b5e6-96231b3b80d8

Author: joker-eph

lib/Transforms/InstCombine/InstCombineCalls.cpp

@@ -1537,7 +1537,7 @@ Instruction *InstCombiner::visitCallSite(CallSite CS) {
   unsigned ArgNo = 0;
   for (Value *V : CS.args()) {
     if (!CS.paramHasAttr(ArgNo+1, Attribute::NonNull) &&
-        isKnownNonNullAt(V, CS.getInstruction(), DT, TLI)) {
+        isKnownNonNull(V)) {
       AttributeSet AS = CS.getAttributes();
       AS = AS.addAttribute(CS.getInstruction()->getContext(), ArgNo+1,
                            Attribute::NonNull);