[turbofan] Reduce boilerplate around HeapNumber allocation in stubs.

src/compiler/code-stub-assembler.cc

 // Copyright 2015 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/compiler/code-stub-assembler.h"
 
 #include <ostream>
 
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
@@ skipping 420 matching lines @@
   if (flags & kDoubleAlignment) {
     return AllocateRawAligned(IntPtrConstant(size_in_bytes), flags, top_address,
                               limit_address);
   }
 #endif
 
   return AllocateRawUnaligned(IntPtrConstant(size_in_bytes), flags, top_address,
                               limit_address);
 }
 
+Node* CodeStubAssembler::AllocateHeapNumber() {
+  Node* result = Allocate(HeapNumber::kSize, kNone);
+  StoreMapNoWriteBarrier(result, HeapNumberMapConstant());
+  return result;
+}
+
+Node* CodeStubAssembler::AllocateHeapNumberWithValue(Node* value) {
+  Node* result = AllocateHeapNumber();
+  StoreHeapNumberValue(result, value);
+  return result;
+}
+
 Node* CodeStubAssembler::Load(MachineType rep, Node* base) {
   return raw_assembler_->Load(rep, base);
 }
 
 Node* CodeStubAssembler::Load(MachineType rep, Node* base, Node* index) {
   return raw_assembler_->Load(rep, base, index);
 }
 
 Node* CodeStubAssembler::Store(MachineRepresentation rep, Node* base,
                                Node* value) {
@@ skipping 452 matching lines @@
       }
     }
   }
 
   bound_ = true;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8