[APInt] Use default constructor instead of explicitly creating a 1-bit APInt in udiv and urem. NFC

The default constructor does the same thing.

llvm-svn: 302487
diff --git a/llvm/lib/Support/APInt.cpp b/llvm/lib/Support/APInt.cpp
index 774fe86..c7685c3 100644
--- a/llvm/lib/Support/APInt.cpp
+++ b/llvm/lib/Support/APInt.cpp
@@ -1599,7 +1599,7 @@
     return APInt(BitWidth, this->U.pVal[0] / RHS.U.pVal[0]);
 
   // We have to compute it the hard way. Invoke the Knuth divide algorithm.
-  APInt Quotient(1,0); // to hold result.
+  APInt Quotient; // to hold result.
   divide(*this, lhsWords, RHS, rhsWords, &Quotient, nullptr);
   return Quotient;
 }
@@ -1646,7 +1646,7 @@
     return APInt(BitWidth, U.pVal[0] % RHS.U.pVal[0]);
 
   // We have to compute it the hard way. Invoke the Knuth divide algorithm.
-  APInt Remainder(1,0);
+  APInt Remainder;
   divide(*this, lhsWords, RHS, rhsWords, nullptr, &Remainder);
   return Remainder;
 }