Use separate random number generator for each randomization pass

src/IceDefs.h

 //===- subzero/src/IceDefs.h - Common Subzero declarations ------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 261 matching lines @@
   return llvm::make_range(Container.rbegin(), Container.rend());
 }
 template <typename T>
 llvm::iterator_range<typename T::reverse_iterator> reverse_range(T &Container) {
   return llvm::make_range(Container.rbegin(), Container.rend());
 }
 
 /// Options for pooling and randomization of immediates.
 enum RandomizeAndPoolImmediatesEnum { RPI_None, RPI_Randomize, RPI_Pool };
 
+/// Salts for Random number generator for different randomization passes.
+enum RandomizationPassesEnum {
+  RPE_BasicBlockReordering,
+  RPE_ConstantBlinding,
+  RPE_FunctionReordering,
+  RPE_GlobalVariableReordering,
+  RPE_NopInsertion,
+  RPE_PooledConstantReordering,
+  RPE_RegAllocRandomization,
+  RPE_num
+};
+
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEDEFS_H