Subzero: Randomize immediates by constant blinding or pooling.

src/IceTargetLoweringX8632.h

Index: src/IceTargetLoweringX8632.h
diff --git a/src/IceTargetLoweringX8632.h b/src/IceTargetLoweringX8632.h
index 499790e5e90bc2ea9489fe3cb9134762db924edd..b5dd4e709f79fdabace4e3a85d3fddd7581bfadf 100644
--- a/src/IceTargetLoweringX8632.h
+++ b/src/IceTargetLoweringX8632.h
@@ -128,6 +128,8 @@ protected:
 
   void sortByAlignment(VarList &Dest, const VarList &Source) const;
 
+  Variable *randomizeImmediate(Constant *Immediate);
+
   // Operand legalization helpers.  To deal with address mode
   // constraints, the helpers will create a new Operand and emit
   // instructions that guarantee that the Operand kind is one of those
@@ -471,6 +473,8 @@ protected:
   SizeT NextLabelNumber;
   bool ComputedLiveRanges;
   VarList PhysicalRegisters;
+  bool ConstantBlindingCookieInitialized;
+  uint32_t ConstantBlindingCookie;
   static IceString RegNames[];
 
 private:
@@ -478,6 +482,7 @@ private:
   TargetX8632 &operator=(const TargetX8632 &) LLVM_DELETED_FUNCTION;
   virtual ~TargetX8632() {}
   template <typename T> void emitConstantPool() const;
+  void emitPooledImmediates() const;
 };
 
 class TargetGlobalInitX8632 : public TargetGlobalInitLowering {