Implemented global redzones.

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 159 matching lines @@
   template <typename T> T *allocate_variable_declaration() {
     static_assert(!std::is_trivially_destructible<T>::value,
                   "allocate_variable_declaration expects non-trivially "
                   "destructible types.");
     T *Ret = Arena->Allocate<T>();
     Dtors.emplace_back([Ret]() { Ret->~T(); });
     return Ret;
   }
 
   // This do nothing method is invoked when a global variable is created, but it
-  // will not be emitted. If we ever need to track the created variabled, having
+  // will not be emitted. If we ever need to track the created variable, having
   // this hook is handy.
   void willNotBeEmitted(VariableDeclaration *) {}
 
   /// Merges Other with this, effectively resetting Other to an empty state.
   void merge(VariableDeclarationList *Other) {
     assert(Other != nullptr);
     addArena(std::move(Other->Arena));
     for (std::size_t i = 0; i < Other->MergedArenas.size(); ++i) {
       addArena(std::move(Other->MergedArenas[i]));
     }
@@ skipping 243 matching lines @@
   RPE_PooledConstantReordering,
   RPE_RegAllocRandomization,
   RPE_num
 };
 
 using RelocOffsetArray = llvm::SmallVector<class RelocOffset *, 4>;
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEDEFS_H