Fix problems with sandboxing and the ARM integrated assembler.

src/IceAssemblerX86Base.h

 //===- subzero/src/IceAssemblerX86Base.h - base x86 assembler -*- C++ -*---===//
 //
 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Modified by the Subzero authors.
 //
 //===----------------------------------------------------------------------===//
 //
@@ skipping 83 matching lines @@
     UnresolvedNearPositions.pop_back();
     return Pos;
   }
 
   bool hasNear() const { return !UnresolvedNearPositions.empty(); }
   bool isUnused() const override {
     return Ice::Label::isUnused() && !hasNear();
   }
 
 private:
-  void nearLinkTo(intptr_t position) {
+  void nearLinkTo(const Assembler &Asm, intptr_t position) {
+    if (Asm.getPreliminary())
+      return;
     assert(!isBound());
     UnresolvedNearPositions.push_back(position);
   }
 
   llvm::SmallVector<intptr_t, 20> UnresolvedNearPositions;
 
   template <class> friend class AssemblerX86Base;
 };
 
 template <class Machine> class AssemblerX86Base : public Assembler {
@@ skipping 951 matching lines @@
   emitUint8(0x66);
 }
 
 } // end of namespace X86Internal
 
 } // end of namespace Ice
 
 #include "IceAssemblerX86BaseImpl.h"
 
 #endif // SUBZERO_SRC_ICEASSEMBLERX86BASE_H