[APInt] Add an assert to check for divide by zero in udivrem. NFC

udiv and urem already had the same assert.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302931 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/APInt.cpp

@@ -1662,6 +1662,7 @@ void APInt::udivrem(const APInt &LHS, const APInt &RHS,
   // Get some size facts about the dividend and divisor
   unsigned lhsWords = getNumWords(LHS.getActiveBits());
   unsigned rhsWords = getNumWords(RHS.getActiveBits());
+  assert(rhsWords && "Performing divrem operation by zero ???");
 
   // Check the degenerate cases
   if (lhsWords == 0) {