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

src/ic/mips/handler-compiler-mips.cc

Index: src/ic/mips/handler-compiler-mips.cc
diff --git a/src/ic/mips/handler-compiler-mips.cc b/src/ic/mips/handler-compiler-mips.cc
index 6e2903d428fd0131ffb3c1be8244d0b7f02630e1..ba81dfe3a05b82320305e9adee4f1454b20e90dd 100644
--- a/src/ic/mips/handler-compiler-mips.cc
+++ b/src/ic/mips/handler-compiler-mips.cc
@@ -559,12 +559,15 @@ void NamedLoadHandlerCompiler::GenerateLoadCallback(
   DCHECK(!scratch3().is(reg));
   DCHECK(!scratch4().is(reg));
   __ push(receiver());
-  if (heap()->InNewSpace(callback->data())) {
-    __ li(scratch3(), callback);
-    __ lw(scratch3(),
-          FieldMemOperand(scratch3(), ExecutableAccessorInfo::kDataOffset));
+  Handle<Object> data(callback->data(), isolate());
+  if (data->IsUndefined() || data->IsSmi()) {
+    __ li(scratch3(), data);
   } else {
-    __ li(scratch3(), Handle<Object>(callback->data(), isolate()));
+    Handle<WeakCell> cell =
+        isolate()->factory()->NewWeakCell(Handle<HeapObject>::cast(data));
+    // The callback is alive if this instruction is executed,
+    // so the weak cell is not cleared and points to data.
+    __ GetWeakValue(scratch3(), cell);
   }
   __ Subu(sp, sp, 6 * kPointerSize);
   __ sw(scratch3(), MemOperand(sp, 5 * kPointerSize));