Subzero: Randomize register assignment.

src/IceTargetLoweringX8632.h

Index: src/IceTargetLoweringX8632.h
diff --git a/src/IceTargetLoweringX8632.h b/src/IceTargetLoweringX8632.h
index 6d209dc8f4c72d179953ef8d9a0c83adea4b9cce..80ed5eddf30b05bc23b7f3f6f1f757512fc74c7b 100644
--- a/src/IceTargetLoweringX8632.h
+++ b/src/IceTargetLoweringX8632.h
@@ -179,6 +179,9 @@ protected:
   OperandX8632Mem *getMemoryOperandForStackSlot(Type Ty, Variable *Slot,
                                                 uint32_t Offset = 0);
 
+  void makeRandomRegisterPermutation(RegisterPermutation &Permutation,
+      const llvm::SmallBitVector &ExcludeRegisters);
+
   // The following are helpers that insert lowered x86 instructions
   // with minimal syntactic overhead, so that the lowering code can
   // look as close to assembly as practical.