A64: Implement HRandom.

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 f011364d1e42555bc081981e3773b094868e7127..14ced8f4408bded7725c1d9dfcc29b805e1af1ef 100644
--- a/src/a64/lithium-a64.h
+++ b/src/a64/lithium-a64.h
@@ -157,6 +157,7 @@ class LCodeGen;
   V(Parameter)                                  \
   V(Power)                                      \
   V(PushArgument)                               \
+  V(Random)                                     \
   V(RegExpLiteral)                              \
   V(Return)                                     \
   V(SeqStringSetChar)                           \
@@ -611,6 +612,19 @@ class LAllocate: public LTemplateInstruction<1, 1, 2> {
 };
 
 
+class LRandom: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LRandom(LOperand* global_object) {
+    inputs_[0] = global_object;
+  }
+
+  LOperand* global_object() { return inputs_[0]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(Random, "random")
+  DECLARE_HYDROGEN_ACCESSOR(Random)
+};
+
+
 class LRegExpLiteral: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(RegExpLiteral, "regexp-literal")