[turbofan] Generalize AllocateStub to allow old space allocation.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 2bf86d4b9c13b6ff9ebe98838f25d0fbe5f55c5d..1a80a5b7bc764d581a7dbd8f2a23915a6e45ecdb 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -57,7 +57,7 @@ namespace internal {
   V(VectorStoreIC)                          \
   V(VectorKeyedStoreIC)                     \
   /* HydrogenCodeStubs */                   \
-  V(AllocateInNewSpace)                     \
+  V(Allocate)                               \
   V(ArrayNArgumentsConstructor)             \
   V(ArrayNoArgumentConstructor)             \
   V(ArraySingleArgumentConstructor)         \
@@ -2683,17 +2683,23 @@ class AllocateMutableHeapNumberStub : public TurboFanCodeStub {
 SIMD128_TYPES(SIMD128_ALLOC_STUB)
 #undef SIMD128_ALLOC_STUB
 
-class AllocateInNewSpaceStub final : public HydrogenCodeStub {
+class AllocateStub final : public HydrogenCodeStub {
  public:
-  explicit AllocateInNewSpaceStub(Isolate* isolate)
-      : HydrogenCodeStub(isolate) {}
+  AllocateStub(Isolate* isolate, PretenureFlag pretenure_flag)
+      : HydrogenCodeStub(isolate) {
+    set_sub_minor_key(PretenureFlagBits::encode(pretenure_flag));
+  }
+
+  PretenureFlag pretenure_flag() const {
+    return PretenureFlagBits::decode(sub_minor_key());
+  }
 
  private:
-  DEFINE_CALL_INTERFACE_DESCRIPTOR(AllocateInNewSpace);
-  DEFINE_HYDROGEN_CODE_STUB(AllocateInNewSpace, HydrogenCodeStub);
+  typedef BitField<PretenureFlag, 0, 1> PretenureFlagBits;
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(Allocate);
+  DEFINE_HYDROGEN_CODE_STUB(Allocate, HydrogenCodeStub);
 };
 
-
 class ArrayConstructorStubBase : public HydrogenCodeStub {
  public:
   ArrayConstructorStubBase(Isolate* isolate,