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

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index d81a00fc92aa93b7e9adbd21ddc703ec4afc3360..a1172262b06cc82bd8034f5e909f7158c611abcd 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -2666,10 +2666,15 @@ 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) {
   Move(value, cell, RelocInfo::EMBEDDED_OBJECT);
   movp(value, FieldOperand(value, WeakCell::kValueOffset));
+}
+
+
+void MacroAssembler::LoadWeakValue(Register value, Handle<WeakCell> cell,
+                                   Label* miss) {
+  GetWeakValue(value, cell);
   JumpIfSmi(value, miss);
 }