Move platform abstraction to base library

src/diy-fp.cc

 // 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.
 
 #include "include/v8stdint.h"
-#include "src/checks.h"
+#include "src/base/logging.h"
 #include "src/diy-fp.h"
 #include "src/globals.h"
 
 namespace v8 {
 namespace internal {
 
 void DiyFp::Multiply(const DiyFp& other) {
   // Simply "emulates" a 128 bit multiplication.
   // However: the resulting number only contains 64 bits. The least
   // significant 64 bits are only used for rounding the most significant 64
@@ skipping 10 matching lines @@
   uint64_t tmp = (bd >> 32) + (ad & kM32) + (bc & kM32);
   // By adding 1U << 31 to tmp we round the final result.
   // Halfway cases will be round up.
   tmp += 1U << 31;
   uint64_t result_f = ac + (ad >> 32) + (bc >> 32) + (tmp >> 32);
   e_ += other.e_ + 64;
   f_ = result_f;
 }
 
 } }  // namespace v8::internal