[vm/shared] Allow smis in field table. Tag shared ClassId and Uint8List static instances.

BUG=#61030
TEST=ci

Change-Id: I9215b1a98ab1f6ef217e0f5020547724df599878
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/445345
Reviewed-by: Slava Egorov <[email protected]>

Author: aam

runtime/vm/object.cc

@@ -13434,13 +13434,14 @@ TypePtr Class::GetInstantiationOf(Zone* zone, const Type& type) const {
 void Field::SetStaticValue(const Object& value) const {
   auto thread = Thread::Current();
   ASSERT(thread->IsDartMutatorThread());
-  ASSERT(value.IsNull() || value.IsSentinel() || value.IsInstance());
+  ASSERT(value.IsNull() || value.IsSentinel() || value.IsInstance() ||
+         value.IsSmi());
 
   ASSERT(is_static());  // Valid only for static dart fields.
   const intptr_t id = field_id();
   ASSERT(id >= 0);
 
-  if (is_shared() && !value.IsImmutable() &&
+  if (is_shared() && !value.IsSmi() && !value.IsImmutable() &&
       !IsTypedDataBaseClassId(value.GetClassId())) {
     const String& error = String::Handle(
         thread->zone(),

sdk/lib/_http/http_impl.dart

@@ -290,6 +290,7 @@ class _CopyingBytesBuilder implements BytesBuilder {
   // Start with 1024 bytes.
   static const int _INIT_SIZE = 1024;
 
+  @pragma("vm:shared")
   static final _emptyList = Uint8List(0);
 
   int _length = 0;

sdk/lib/_internal/vm/lib/convert_patch.dart

@@ -1577,6 +1577,7 @@ class _JsonStringDecoderSink extends StringConversionSinkBase {
  */
 class _JsonUtf8Parser extends _JsonParserWithListener
     with _ChunkedJsonParser<Uint8List> {
+  @pragma("vm:shared")
   static final Uint8List emptyChunk = Uint8List(0);
 
   final _Utf8Decoder decoder;

sdk/lib/_internal/vm_shared/lib/compact_hash.dart

@@ -337,6 +337,7 @@ mixin _IdenticalAndIdentityHashCode implements _EqualsAndHashCode {
 }
 
 mixin _OperatorEqualsAndCanonicalHashCode implements _EqualsAndHashCode {
+  @pragma('vm:shared')
   static final int cidSymbol = ClassID.getID(#a);
 
   int _hashCode(Object? e) {