Bulk update of Google copyright headers in source files.

src/atomicops_internals_x86_gcc.h

 // Copyright 2010 the V8 project authors. All rights reserved.
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-//       copyright notice, this list of conditions and the following
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-//       contributors may be used to endorse or promote products derived
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+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
 // This file is an internal atomic implementation, use atomicops.h instead.
 
 #ifndef V8_ATOMICOPS_INTERNALS_X86_GCC_H_
 #define V8_ATOMICOPS_INTERNALS_X86_GCC_H_
 
 namespace v8 {
 namespace internal {
 
 // This struct is not part of the public API of this module; clients may not
@@ skipping 249 matching lines @@
   return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
 }
 
 #endif  // defined(__x86_64__)
 
 } }  // namespace v8::internal
 
 #undef ATOMICOPS_COMPILER_BARRIER
 
 #endif  // V8_ATOMICOPS_INTERNALS_X86_GCC_H_