Load callback data from weak cell instead of embedding it in handler.

src/arm64/macro-assembler-arm64.cc

Index: src/arm64/macro-assembler-arm64.cc
diff --git a/src/arm64/macro-assembler-arm64.cc b/src/arm64/macro-assembler-arm64.cc
index 37739d9c165901bfae47281023d93d502fb8c274..8b559755a0bdde64d32145e3e493791205a23e3a 100644
--- a/src/arm64/macro-assembler-arm64.cc
+++ b/src/arm64/macro-assembler-arm64.cc
@@ -3675,10 +3675,15 @@ void MacroAssembler::CmpWeakValue(Register value, Handle<WeakCell> cell,
 }
 
 
-void MacroAssembler::LoadWeakValue(Register value, Handle<WeakCell> cell,
-                                   Label* miss) {
+void MacroAssembler::GetWeakValue(Register value, Handle<WeakCell> cell) {
   Mov(value, Operand(cell));
   Ldr(value, FieldMemOperand(value, WeakCell::kValueOffset));
+}
+
+
+void MacroAssembler::LoadWeakValue(Register value, Handle<WeakCell> cell,
+                                   Label* miss) {
+  GetWeakValue(value, cell);
   JumpIfSmi(value, miss);
 }