[serializer] allocate global proxy with the expected size.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index e95dd2965ba708eabe6c6fbd18b0a13d6c0adce2..b688c1c06478d15ac8ec13c544bbbd5286c04ce8 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -2863,6 +2863,7 @@ void Heap::CreateInitialObjects() {
   set_array_buffer_neutering_protector(*cell);
 
   set_serialized_templates(empty_fixed_array());
+  set_serialized_global_proxy_sizes(empty_fixed_array());
 
   set_weak_stack_trace_list(Smi::kZero);
 
@@ -2896,6 +2897,7 @@ bool Heap::RootCanBeWrittenAfterInitialization(Heap::RootListIndex root_index) {
     case kNoScriptSharedFunctionInfosRootIndex:
     case kWeakStackTraceListRootIndex:
     case kSerializedTemplatesRootIndex:
+    case kSerializedGlobalProxySizesRootIndex:
     case kPublicSymbolTableRootIndex:
     case kApiSymbolTableRootIndex:
     case kApiPrivateSymbolTableRootIndex: