A64: Implement LShiftS

src/a64/lithium-a64.h

Index: src/a64/lithium-a64.h
diff --git a/src/a64/lithium-a64.h b/src/a64/lithium-a64.h
index 94fcb4b04395776273b1a5e20f15c35749f1b9fb..a7e6717cbfc568afa71a3fd9e63e00aa89b9edea 100644
--- a/src/a64/lithium-a64.h
+++ b/src/a64/lithium-a64.h
@@ -162,6 +162,7 @@ class LCodeGen;
   V(Return)                                     \
   V(SeqStringSetChar)                           \
   V(ShiftI)                                     \
+  V(ShiftS)                                     \
   V(SmiTag)                                     \
   V(SmiUntag)                                   \
   V(StackCheck)                                 \
@@ -2461,6 +2462,29 @@ class LShiftI V8_FINAL : public LTemplateInstruction<1, 2, 0> {
 };
 
 
+class LShiftS V8_FINAL : public LTemplateInstruction<1, 2, 1> {
+ public:
+  LShiftS(Token::Value op, LOperand* left, LOperand* right, LOperand* temp,
+          bool can_deopt) : op_(op), can_deopt_(can_deopt) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+    temps_[0] = temp;
+  }
+
+  Token::Value op() const { return op_; }
+  LOperand* left() { return inputs_[0]; }
+  LOperand* right() { return inputs_[1]; }
+  LOperand* temp() { return temps_[0]; }
+  bool can_deopt() const { return can_deopt_; }
+
+  DECLARE_CONCRETE_INSTRUCTION(ShiftS, "shift-s")
+
+ private:
+  Token::Value op_;
+  bool can_deopt_;
+};
+
+
 class LStoreCodeEntry V8_FINAL: public LTemplateInstruction<0, 2, 1> {
  public:
   LStoreCodeEntry(LOperand* function, LOperand* code_object,