[stubs] Introduce LeftShift, SignedRightShift and UnsignedRightShift stubs.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 1a80a5b7bc764d581a7dbd8f2a23915a6e45ecdb..f9bb8309274bbe73bbc06a4dcad7b7ee1b49a6bc 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -115,6 +115,9 @@ namespace internal {
   V(Multiply)                               \
   V(Divide)                                 \
   V(Modulus)                                \
+  V(ShiftRight)                             \
+  V(ShiftRightLogical)                      \
+  V(ShiftLeft)                              \
   V(BitwiseAnd)                             \
   V(BitwiseOr)                              \
   V(BitwiseXor)                             \
@@ -713,6 +716,31 @@ class ModulusStub final : public TurboFanCodeStub {
   DEFINE_TURBOFAN_CODE_STUB(Modulus, TurboFanCodeStub);
 };
 
+class ShiftRightStub final : public TurboFanCodeStub {
+ public:
+  explicit ShiftRightStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(BinaryOp);
+  DEFINE_TURBOFAN_CODE_STUB(ShiftRight, TurboFanCodeStub);
+};
+
+class ShiftRightLogicalStub final : public TurboFanCodeStub {
+ public:
+  explicit ShiftRightLogicalStub(Isolate* isolate)
+      : TurboFanCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(BinaryOp);
+  DEFINE_TURBOFAN_CODE_STUB(ShiftRightLogical, TurboFanCodeStub);
+};
+
+class ShiftLeftStub final : public TurboFanCodeStub {
+ public:
+  explicit ShiftLeftStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(BinaryOp);
+  DEFINE_TURBOFAN_CODE_STUB(ShiftLeft, TurboFanCodeStub);
+};
+
 class BitwiseAndStub final : public TurboFanCodeStub {
  public:
   explicit BitwiseAndStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
@@ -2512,7 +2540,7 @@ class ScriptContextFieldStub : public HandlerStub {
 
  private:
   static const int kContextIndexBits = 9;
-  static const int kSlotIndexBits = 13;
+  static const int kSlotIndexBits = 12;
   class ContextIndexBits : public BitField<int, 0, kContextIndexBits> {};
   class SlotIndexBits
       : public BitField<int, kContextIndexBits, kSlotIndexBits> {};