Add option to force filetype=asm for testing

src/IceTargetLoweringX86Base.h

 //===- subzero/src/IceTargetLoweringX86Base.h - x86 lowering ----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 547 matching lines @@
   }
   void _pand(Variable *Dest, Operand *Src0) {
     Context.insert<typename Traits::Insts::Pand>(Dest, Src0);
   }
   void _pandn(Variable *Dest, Operand *Src0) {
     Context.insert<typename Traits::Insts::Pandn>(Dest, Src0);
   }
   void _pblendvb(Variable *Dest, Operand *Src0, Operand *Src1) {
     Context.insert<typename Traits::Insts::Pblendvb>(Dest, Src0, Src1);
   }
-  void _pcmpeq(Variable *Dest, Operand *Src0) {
-    Context.insert<typename Traits::Insts::Pcmpeq>(Dest, Src0);
+  void _pcmpeq(Variable *Dest, Operand *Src0,
+               Type ArithmeticTypeOverride = IceType_void) {
+    Context.insert<typename Traits::Insts::Pcmpeq>(Dest, Src0,
+                                                   ArithmeticTypeOverride);
   }
   void _pcmpgt(Variable *Dest, Operand *Src0) {
     Context.insert<typename Traits::Insts::Pcmpgt>(Dest, Src0);
   }
   void _pextr(Variable *Dest, Operand *Src0, Operand *Src1) {
     Context.insert<typename Traits::Insts::Pextr>(Dest, Src0, Src1);
   }
   void _pinsr(Variable *Dest, Operand *Src0, Operand *Src1) {
     Context.insert<typename Traits::Insts::Pinsr>(Dest, Src0, Src1);
   }
@@ skipping 259 matching lines @@
 
   static FixupKind PcRelFixup;
   static FixupKind AbsFixup;
 };
 } // end of namespace X86NAMESPACE
 } // end of namespace Ice
 
 #include "IceTargetLoweringX86BaseImpl.h"
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX86BASE_H