[intrinsics] Drop the now obsolete %_DoubleHi and %_DoubleLo intrinsics.

src/runtime/runtime-maths.cc

 // Copyright 2014 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 "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/assembler.h"
 #include "src/base/utils/random-number-generator.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
 
 namespace v8 {
 namespace internal {
 
-RUNTIME_FUNCTION(Runtime_DoubleHi) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_DOUBLE_ARG_CHECKED(x, 0);
-  uint64_t unsigned64 = double_to_uint64(x);
-  uint32_t unsigned32 = static_cast<uint32_t>(unsigned64 >> 32);
-  int32_t signed32 = bit_cast<int32_t, uint32_t>(unsigned32);
-  return *isolate->factory()->NewNumber(signed32);
-}
-
-
-RUNTIME_FUNCTION(Runtime_DoubleLo) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_DOUBLE_ARG_CHECKED(x, 0);
-  uint64_t unsigned64 = double_to_uint64(x);
-  uint32_t unsigned32 = static_cast<uint32_t>(unsigned64);
-  int32_t signed32 = bit_cast<int32_t, uint32_t>(unsigned32);
-  return *isolate->factory()->NewNumber(signed32);
-}
-
-
 RUNTIME_FUNCTION(Runtime_GenerateRandomNumbers) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   if (isolate->serializer_enabled()) {
     // Random numbers in the snapshot are not really that random. And we cannot
     // return a typed array as it cannot be serialized. To make calling
     // Math.random possible when creating a custom startup snapshot, we simply
     // return a normal array with a single random number.
     Handle<HeapNumber> random_number = isolate->factory()->NewHeapNumber(
         isolate->random_number_generator()->NextDouble());
@@ skipping 37 matching lines @@
     base::RandomNumberGenerator::XorShift128(&state0, &state1);
     array[i] = base::RandomNumberGenerator::ToDouble(state0, state1);
   }
   // Persist current state.
   array[kState0Offset] = uint64_to_double(state0);
   array[kState1Offset] = uint64_to_double(state1);
   return *typed_array;
 }
 }  // namespace internal
 }  // namespace v8