Drop obsolete misc-intrinsics.h file.

src/misc-intrinsics.h

-// Copyright 2011 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.
-
-#ifndef V8_MISC_INTRINSICS_H_
-#define V8_MISC_INTRINSICS_H_
-
-#include "include/v8.h"
-#include "src/globals.h"
-
-namespace v8 {
-namespace internal {
-
-// Returns the index of the leading 1 bit, counting the least significant bit at
-// index 0.  (1 << IntegerLog2(x)) is a mask for the most significant bit of x.
-// Result is undefined if input is zero.
-int IntegerLog2(uint32_t value);
-
-#if defined(__GNUC__)
-
-inline int IntegerLog2(uint32_t value) {
-  return 31 - __builtin_clz(value);
-}
-
-#elif defined(_MSC_VER)
-
-#pragma intrinsic(_BitScanReverse)
-
-inline int IntegerLog2(uint32_t value) {
-  unsigned long result;             // NOLINT: MSVC intrinsic demands this type.
-  _BitScanReverse(&result, value);
-  return result;
-}
-
-#else
-
-// Default version using regular operations. Code taken from:
-// http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog
-inline int IntegerLog2(uint32_t value) {
-  int result, shift;
-
-  shift = (value > 0xFFFF) << 4;
-  value >>= shift;
-  result = shift;
-
-  shift = (value > 0xFF) << 3;
-  value >>= shift;
-  result |= shift;
-
-  shift = (value > 0xF) << 2;
-  value >>= shift;
-  result |= shift;
-
-  shift = (value > 0x3) << 1;
-  value >>= shift;
-  result |= shift;
-
-  result |= (value >> 1);
-
-  return result;
-}
-#endif
-
-} }  // namespace v8::internal
-
-#endif  // V8_MISC_INTRINSICS_H_