[turbofan] Adds an Allocate macro to the CodeStubAssembler.

src/code-stubs.cc

Index: src/code-stubs.cc
diff --git a/src/code-stubs.cc b/src/code-stubs.cc
index b56beb8d524bf449d67bc9bf34705e586f97727a..08ca32ed0d5fe76c65afe71f4b9e3b66a821c14c 100644
--- a/src/code-stubs.cc
+++ b/src/code-stubs.cc
@@ -472,6 +472,32 @@ void StringLengthStub::GenerateAssembly(
   assembler->Return(result);
 }
 
+void AllocateHeapNumberStub::GenerateAssembly(
+    compiler::CodeStubAssembler* assembler) const {
+  compiler::Node* result = assembler->Allocate(
+      HeapNumber::kSize, compiler::AllocationFlags::kTagObject);
+
+  assembler->StoreNoWriteBarrier(
+      MachineRepresentation::kTagged,
+      assembler->IntPtrAdd(

[Benedikt Meurer, 2016/02/25 13:00:40]

Please don't nest these computations, add separate named temporaries as in the
StringLengthStub please.

[epertoso, 2016/02/25 13:26:53]

Done.

+          result,
+          assembler->IntPtrConstant(HeapObject::kMapOffset - kHeapObjectTag)),
+      assembler->HeapConstant(isolate()->factory()->heap_number_map()));
+  assembler->Return(result);
+}
+
+void AllocateMutableHeapNumberStub::GenerateAssembly(
+    compiler::CodeStubAssembler* assembler) const {
+  compiler::Node* result = assembler->Allocate(
+      HeapNumber::kSize, compiler::AllocationFlags::kTagObject);
+  assembler->StoreNoWriteBarrier(

[Benedikt Meurer, 2016/02/25 13:00:40]

Same here.

[epertoso, 2016/02/25 13:26:53]

Done.

+      MachineRepresentation::kTagged,
+      assembler->IntPtrAdd(
+          result,
+          assembler->IntPtrConstant(HeapObject::kMapOffset - kHeapObjectTag)),
+      assembler->HeapConstant(isolate()->factory()->mutable_heap_number_map()));
+  assembler->Return(result);
+}
 
 template<class StateType>
 void HydrogenCodeStub::TraceTransition(StateType from, StateType to) {