Subzero. Native 64-bit int arithmetic on x86-64.

src/IceTargetLoweringX8632Traits.h

Index: src/IceTargetLoweringX8632Traits.h
diff --git a/src/IceTargetLoweringX8632Traits.h b/src/IceTargetLoweringX8632Traits.h
index 29066aa6ae0ac191646cacbbb1b80c83cdfbce10..e0acbd674ce6f55011a30bad3566230235588ee2 100644
--- a/src/IceTargetLoweringX8632Traits.h
+++ b/src/IceTargetLoweringX8632Traits.h
@@ -68,6 +68,7 @@ template <> struct MachineTraits<TargetX8632> {
   static const GPRRegister Encoded_Reg_Accumulator = RegX8632::Encoded_Reg_eax;
   static const GPRRegister Encoded_Reg_Counter = RegX8632::Encoded_Reg_ecx;
   static const FixupKind PcRelFixup = llvm::ELF::R_386_PC32;
+  static const FixupKind RelFixup = llvm::ELF::R_386_32;
 
   class Operand {
   public:
@@ -272,6 +273,7 @@ template <> struct MachineTraits<TargetX8632> {
   };
 
   static const char *TargetName;
+  static constexpr Type WordType = IceType_i32;
 
   static IceString getRegName(SizeT RegNum, Type Ty) {
     assert(RegNum < RegisterSet::Reg_NUM);