Add option to force filetype=asm for testing

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 886 matching lines @@
         if (Iter.PreferReg == i)
           Iter.AllowOverlap = false;
       }
     }
 
     // Print info about physical register availability.
     if (BuildDefs::dump() && Verbose) {
       Ostream &Str = Ctx->getStrDump();
       for (SizeT i = 0; i < Iter.RegMask.size(); ++i) {
         if (Iter.RegMask[i]) {
-          Str << Target->getRegName(i, IceType_i32) << "(U=" << RegUses[i]
-              << ",F=" << Iter.Free[i]
+          Str << Target->getRegName(i, Iter.Cur->getType())
+              << "(U=" << RegUses[i] << ",F=" << Iter.Free[i]
               << ",P=" << Iter.PrecoloredUnhandledMask[i] << ") ";
         }
       }
       Str << "\n";
     }
 
     if (Iter.Prefer && (Iter.AllowOverlap || Iter.Free[Iter.PreferReg])) {
       // First choice: a preferred register that is either free or is allowed to
       // overlap with its linked variable.
       allocatePreferredRegister(Iter);
@@ skipping 59 matching lines @@
     Str << "\n";
   }
   Str << "++++++ Inactive:\n";
   for (const Variable *Item : Inactive) {
     dumpLiveRange(Item, Func);
     Str << "\n";
   }
 }
 
 } // end of namespace Ice