Subzero: Use cvttss2si and similar instead of cvtss2si for fp->int casts.

src/IceTargetLoweringX8632.h

 //===- subzero/src/IceTargetLoweringX8632.h - x86-32 lowering ---*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the TargetLoweringX8632 class, which
@@ skipping 246 matching lines @@
   }
   void _cmpxchg8b(OperandX8632 *Addr, Variable *Edx, Variable *Eax,
                   Variable *Ecx, Variable *Ebx, bool Locked) {
     Context.insert(
         InstX8632Cmpxchg8b::create(Func, Addr, Edx, Eax, Ecx, Ebx, Locked));
     // Mark edx, and eax as possibly modified by cmpxchg8b.
     Context.insert(InstFakeDef::create(Func, Edx));
     Context.insert(InstFakeDef::create(Func, Eax));
   }
   void _cvt(Variable *Dest, Operand *Src0) {
-    Context.insert(InstX8632Cvt::create(Func, Dest, Src0));
+    const bool Trunc = false;
+    Context.insert(InstX8632Cvt::create(Func, Dest, Src0, Trunc));
+  }
+  void _cvtt(Variable *Dest, Operand *Src0) {
+    const bool Trunc = true;
+    Context.insert(InstX8632Cvt::create(Func, Dest, Src0, Trunc));
   }
   void _div(Variable *Dest, Operand *Src0, Operand *Src1) {
     Context.insert(InstX8632Div::create(Func, Dest, Src0, Src1));
   }
   void _divps(Variable *Dest, Operand *Src0) {
     Context.insert(InstX8632Divps::create(Func, Dest, Src0));
   }
   void _divss(Variable *Dest, Operand *Src0) {
     Context.insert(InstX8632Divss::create(Func, Dest, Src0));
   }
@@ skipping 226 matching lines @@
   virtual ~TargetGlobalInitX8632() {}
 };
 
 template <> void ConstantInteger::emit(GlobalContext *Ctx) const;
 template <> void ConstantFloat::emit(GlobalContext *Ctx) const;
 template <> void ConstantDouble::emit(GlobalContext *Ctx) const;
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX8632_H