Remove some dead code.

src/jump-target.h

-// Copyright 2008 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_JUMP_TARGET_H_
-#define V8_JUMP_TARGET_H_
-
-#if V8_TARGET_ARCH_IA32
-#include "jump-target-heavy.h"
-#elif V8_TARGET_ARCH_X64
-#include "jump-target-heavy.h"
-#elif V8_TARGET_ARCH_ARM
-#include "jump-target-light.h"
-#elif V8_TARGET_ARCH_MIPS
-#include "jump-target-light.h"
-#else
-#error Unsupported target architecture.
-#endif
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// Shadow break targets
-//
-// A shadow break target represents a break target that is temporarily
-// shadowed by another one (represented by the original during
-// shadowing).  They are used to catch jumps to labels in certain
-// contexts, e.g. try blocks.  After shadowing ends, the formerly
-// shadowed target is again represented by the original and the
-// ShadowTarget can be used as a jump target in its own right,
-// representing the formerly shadowing target.
-
-class ShadowTarget : public BreakTarget {
- public:
-  // Construct a shadow jump target.  After construction the shadow
-  // target object holds the state of the original target, and the
-  // original target is actually a fresh one that intercepts control
-  // flow intended for the shadowed one.
-  explicit ShadowTarget(BreakTarget* shadowed);
-
-  virtual ~ShadowTarget() {}
-
-  // End shadowing.  After shadowing ends, the original jump target
-  // again gives access to the formerly shadowed target and the shadow
-  // target object gives access to the formerly shadowing target.
-  void StopShadowing();
-
-  // During shadowing, the currently shadowing target.  After
-  // shadowing, the target that was shadowed.
-  BreakTarget* other_target() const { return other_target_; }
-
- private:
-  // During shadowing, the currently shadowing target.  After
-  // shadowing, the target that was shadowed.
-  BreakTarget* other_target_;
-
-#ifdef DEBUG
-  bool is_shadowing_;
-#endif
-
-  DISALLOW_COPY_AND_ASSIGN(ShadowTarget);
-};
-
-} }  // namespace v8::internal
-
-#endif  // V8_JUMP_TARGET_H_