[Interpreter] Introduce IncStub and DecStub.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index b1e42591281c032e48e518b09f75d6da9ee045d5..b4e6f995b6308e8748d85919be735e01a1e26b76 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -120,6 +120,8 @@ namespace internal {
   V(BitwiseAnd)                             \
   V(BitwiseOr)                              \
   V(BitwiseXor)                             \
+  V(Inc)                                    \
+  V(Dec)                                    \
   V(FastCloneShallowObject)                 \
   V(LessThan)                               \
   V(LessThanOrEqual)                        \
@@ -763,6 +765,22 @@ class BitwiseXorStub final : public TurboFanCodeStub {
   DEFINE_TURBOFAN_CODE_STUB(BitwiseXor, TurboFanCodeStub);
 };
 
+class IncStub final : public TurboFanCodeStub {
+ public:
+  explicit IncStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(CountOp);
+  DEFINE_TURBOFAN_CODE_STUB(Inc, TurboFanCodeStub);
+};
+
+class DecStub final : public TurboFanCodeStub {
+ public:
+  explicit DecStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(CountOp);
+  DEFINE_TURBOFAN_CODE_STUB(Dec, TurboFanCodeStub);
+};
+
 class LessThanStub final : public TurboFanCodeStub {
  public:
   explicit LessThanStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}