Subzero: Fix some build problems against LLVM trunk.

src/IceRegAlloc.cpp

 //===- subzero/src/IceRegAlloc.cpp - Linear-scan implementation -----------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 56 matching lines @@
   }
   Str << "\n";
 }
 
 void dumpLiveRange(const Variable *Var, const Cfg *Func) {
   if (!BuildDefs::dump())
     return;
   Ostream &Str = Func->getContext()->getStrDump();
   Str << "R=";
   if (Var->hasRegTmp()) {
-    Str << llvm::format("%2d", Var->getRegNumTmp());
+    Str << llvm::format("%2d", int(Var->getRegNumTmp()));
   } else {
     Str << "NA";
   }
   Str << "  V=";
   Var->dump(Func);
   Str << "  Range=" << Var->getLiveRange();
 }
 
 int32_t findMinWeightIndex(
     const SmallBitVector &RegMask,
@@ skipping 933 matching lines @@
     Str << "\n";
   }
   Str << "++++++ Inactive:\n";
   for (const Variable *Item : Inactive) {
     dumpLiveRange(Item, Func);
     Str << "\n";
   }
 }
 
 } // end of namespace Ice