Introduce a V8_NORETURN macro and use it to make GCC 4.9.2 happy again.

src/base/platform/platform.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This module contains the platform-specific code. This make the rest of the
 // code less dependent on operating system, compilers and runtime libraries.
 // This module does specifically not deal with differences between different
 // processor architecture.
 // The platform classes have the same definition for all platforms. The
 // implementation for a particular platform is put in platform_<os>.cc.
@@ skipping 176 matching lines @@
   // Generate a random address to be used for hinting mmap().
   static void* GetRandomMmapAddr();
 
   // Get the Alignment guaranteed by Allocate().
   static size_t AllocateAlignment();
 
   // Sleep for a number of milliseconds.
   static void Sleep(const int milliseconds);
 
   // Abort the current process.
-  static void Abort();
+  V8_NORETURN static void Abort();
 
   // Debug break.
   static void DebugBreak();
 
   // Walk the stack.
   static const int kStackWalkError = -1;
   static const int kStackWalkMaxNameLen = 256;
   static const int kStackWalkMaxTextLen = 256;
   struct StackFrame {
     void* address;
@@ skipping 260 matching lines @@
   char name_[kMaxThreadNameLength];
   int stack_size_;
   Semaphore* start_semaphore_;
 
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 } }  // namespace v8::base
 
 #endif  // V8_BASE_PLATFORM_PLATFORM_H_