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 6d209dc8f4c72d179953ef8d9a0c83adea4b9cce..ea6cdb97debc2dbe629f9ec51144112a29c20c5d 100644
--- a/src/IceTargetLoweringX8632.h
+++ b/src/IceTargetLoweringX8632.h
@@ -40,7 +40,7 @@ public:
   virtual SizeT getFrameOrStackReg() const {
     return IsEbpBasedFrame ? Reg_ebp : Reg_esp;
   }
-  virtual size_t typeWidthInBytesOnStack(Type Ty) {
+  virtual size_t typeWidthInBytesOnStack(Type Ty) const {
     // Round up to the next multiple of 4 bytes.  In particular, i1,
     // i8, and i16 are rounded up to 4 bytes.
     return (typeWidthInBytes(Ty) + 3) & ~3;
@@ -125,6 +125,8 @@ protected:
   void scalarizeArithmetic(InstArithmetic::OpKind K, Variable *Dest,
                            Operand *Src0, Operand *Src1);
 
+  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
@@ -472,6 +474,7 @@ private:
   TargetX8632 &operator=(const TargetX8632 &) LLVM_DELETED_FUNCTION;
   virtual ~TargetX8632() {}
   template <typename T> void emitConstantPool() const;
+  void emitPooledImmediates() const;
 };
 
 class TargetGlobalInitX8632 : public TargetGlobalInitLowering {