A64: Implement LDeclareGlobals.

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..8f40726ce06ca9c12ae1fb651f885933fad34c8e 100644
--- a/src/a64/lithium-a64.h
+++ b/src/a64/lithium-a64.h
@@ -90,6 +90,7 @@ class LCodeGen;
   V(Context)                                    \
   V(DateField)                                  \
   V(DebugBreak)                                 \
+  V(DeclareGlobals)                             \
   V(Deoptimize)                                 \
   V(DivI)                                       \
   V(DoubleToI)                                  \
@@ -1190,6 +1191,13 @@ class LDebugBreak: public LTemplateInstruction<0, 0, 0> {
 };
 
 
+class LDeclareGlobals: public LTemplateInstruction<0, 0, 0> {
+ public:
+  DECLARE_CONCRETE_INSTRUCTION(DeclareGlobals, "declare-globals")
+  DECLARE_HYDROGEN_ACCESSOR(DeclareGlobals)
+};
+
+
 class LDeoptimize: public LTemplateInstruction<0, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(Deoptimize, "deoptimize")