A64: Port LSeqStringGetChar.

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 0c2623dd9bfe49ba071af75021d8431ff91796ce..982318e719ca123c2e4bd2cbda14cf07e42719d8 100644
--- a/src/a64/lithium-a64.h
+++ b/src/a64/lithium-a64.h
@@ -161,6 +161,7 @@ class LCodeGen;
   V(Random)                                     \
   V(RegExpLiteral)                              \
   V(Return)                                     \
+  V(SeqStringGetChar)                           \
   V(SeqStringSetChar)                           \
   V(ShiftI)                                     \
   V(ShiftS)                                     \
@@ -2141,6 +2142,25 @@ class LReturn V8_FINAL : public LTemplateInstruction<0, 2, 0> {
 };
 
 
+class LSeqStringGetChar V8_FINAL : public LTemplateInstruction<1, 2, 1> {
+ public:
+  LSeqStringGetChar(LOperand* string,
+                    LOperand* index,
+                    LOperand* temp) {
+    inputs_[0] = string;
+    inputs_[1] = index;
+    temps_[0] = temp;
+  }
+
+  LOperand* string() { return inputs_[0]; }
+  LOperand* index() { return inputs_[1]; }
+  LOperand* temp() { return temps_[0]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(SeqStringGetChar, "seq-string-get-char")
+  DECLARE_HYDROGEN_ACCESSOR(SeqStringGetChar)
+};
+
+
 class LSeqStringSetChar V8_FINAL : public LTemplateInstruction<1, 3, 1> {
  public:
   LSeqStringSetChar(String::Encoding encoding,