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

src/ic/mips64/handler-compiler-mips64.cc

Index: src/ic/mips64/handler-compiler-mips64.cc
diff --git a/src/ic/mips64/handler-compiler-mips64.cc b/src/ic/mips64/handler-compiler-mips64.cc
index 65f0902377453d2396b05ba8713eb917072e170a..a64b9440f59f40011266ad4c12d09b40f9fcaa0e 100644
--- a/src/ic/mips64/handler-compiler-mips64.cc
+++ b/src/ic/mips64/handler-compiler-mips64.cc
@@ -560,12 +560,15 @@ void NamedLoadHandlerCompiler::GenerateLoadCallback(
   DCHECK(!scratch3().is(reg));
   DCHECK(!scratch4().is(reg));
   __ push(receiver());
-  if (heap()->InNewSpace(callback->data())) {
-    __ li(scratch3(), callback);
-    __ ld(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);
   }
   __ Dsubu(sp, sp, 6 * kPointerSize);
   __ sd(scratch3(), MemOperand(sp, 5 * kPointerSize));