Remove base's ALIGNOF/ALIGNAS in favor of alignof/alignas.

base/compiler_specific.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_COMPILER_SPECIFIC_H_
 #define BASE_COMPILER_SPECIFIC_H_
 
 #include "build/build_config.h"
 
 #if defined(COMPILER_MSVC)
@@ skipping 90 matching lines @@
 #endif
 
 #if COMPILER_GCC && defined(NDEBUG)
 #define ALWAYS_INLINE inline __attribute__((__always_inline__))
 #elif COMPILER_MSVC && defined(NDEBUG)
 #define ALWAYS_INLINE __forceinline
 #else
 #define ALWAYS_INLINE inline
 #endif
 
-// Specify memory alignment for structs, classes, etc.
-// Use like:
-//   class ALIGNAS(16) MyClass { ... }
-//   ALIGNAS(16) int array[4];
-#if defined(COMPILER_MSVC)
-#define ALIGNAS(byte_alignment) __declspec(align(byte_alignment))
-#elif defined(COMPILER_GCC)
-#define ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment)))
-#endif
-
-// Return the byte alignment of the given type (available at compile time).
-// Use like:
-//   ALIGNOF(int32_t)  // this would be 4
-#if defined(COMPILER_MSVC)
-#define ALIGNOF(type) __alignof(type)
-#elif defined(COMPILER_GCC)
-#define ALIGNOF(type) __alignof__(type)
-#endif
-
 // Annotate a function indicating the caller must examine the return value.
 // Use like:
 //   int foo() WARN_UNUSED_RESULT;
 // To explicitly ignore a result, see |ignore_result()| in base/macros.h.
 #undef WARN_UNUSED_RESULT
 #if defined(COMPILER_GCC) || defined(__clang__)
 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
 #else
 #define WARN_UNUSED_RESULT
 #endif
@@ skipping 84 matching lines @@
 
 // Compiler feature-detection.
 // clang.llvm.org/docs/LanguageExtensions.html#has-feature-and-has-extension
 #if defined(__has_feature)
 #define HAS_FEATURE(FEATURE) __has_feature(FEATURE)
 #else
 #define HAS_FEATURE(FEATURE) 0
 #endif
 
 #endif  // BASE_COMPILER_SPECIFIC_H_