Index: include/llvm/ADT/APInt.h
===================================================================
--- include/llvm/ADT/APInt.h
+++ include/llvm/ADT/APInt.h
@@ -181,7 +181,7 @@
                      unsigned rhsWords, APInt *Quotient, APInt *Remainder);
 
   /// out-of-line slow case for inline constructor
-  void initSlowCase(unsigned numBits, uint64_t val, bool isSigned);
+  void initSlowCase(uint64_t val, bool isSigned);
 
   /// shared code between two array constructors
   void initFromArray(ArrayRef<uint64_t> array);
@@ -239,7 +239,7 @@
     if (isSingleWord())
       VAL = val;
     else
-      initSlowCase(numBits, val, isSigned);
+      initSlowCase(val, isSigned);
     clearUnusedBits();
   }
 
Index: lib/Support/APInt.cpp
===================================================================
--- lib/Support/APInt.cpp
+++ lib/Support/APInt.cpp
@@ -75,7 +75,7 @@
 }
 
 
-void APInt::initSlowCase(unsigned numBits, uint64_t val, bool isSigned) {
+void APInt::initSlowCase(uint64_t val, bool isSigned) {
   pVal = getClearedMemory(getNumWords());
   pVal[0] = val;
   if (isSigned && int64_t(val) < 0)