[modular_aot] Serialization of type parameter declarations in module snapshots

TEST=ci

Issue: https://github.com/dart-lang/sdk/issues/61635
Change-Id: Ia5646ec6e2133a2232ffbbdb4926d94296bcd690
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/505522
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Slava Egorov <vegorov@google.com>

runtime/vm/module_snapshot.cc

@@ -931,6 +931,31 @@ class InstanceDeserializationCluster : public DeserializationCluster {
   intptr_t instance_size_ = 0;
 };
 
+class TypeParametersDeserializationCluster : public DeserializationCluster {
+ public:
+  TypeParametersDeserializationCluster()
+      : DeserializationCluster("TypeParameters") {}
+  ~TypeParametersDeserializationCluster() {}
+
+  void ReadAlloc(Deserializer* d) override {
+    ReadAllocFixedSize(d, TypeParameters::InstanceSize());
+  }
+
+  void ReadFill(Deserializer* d_) override {
+    Deserializer::Local d(d_);
+
+    for (intptr_t id = start_index_, n = stop_index_; id < n; id++) {
+      TypeParametersPtr tps = static_cast<TypeParametersPtr>(d.Ref(id));
+      Deserializer::InitializeHeader(tps, kTypeParametersCid,
+                                     TypeParameters::InstanceSize());
+      tps->untag()->names_ = static_cast<ArrayPtr>(d.ReadRef());
+      tps->untag()->flags_ = static_cast<ArrayPtr>(d.null());
+      tps->untag()->bounds_ = static_cast<TypeArgumentsPtr>(d.ReadRef());
+      tps->untag()->defaults_ = static_cast<TypeArgumentsPtr>(d.ReadRef());
+    }
+  }
+};
+
 class TypeArgumentsDeserializationCluster : public DeserializationCluster {
  public:
   TypeArgumentsDeserializationCluster()
@@ -1544,9 +1569,7 @@ DeserializationCluster* Deserializer::ReadCluster() {
       UNIMPLEMENTED();
       return nullptr;
     case ModuleSnapshot::kTypeParameters:
-      // return new (Z) TypeParametersDeserializationCluster();
-      UNIMPLEMENTED();
-      return nullptr;
+      return new (Z) TypeParametersDeserializationCluster();
     case ModuleSnapshot::kInterfaceTypes:
       return new (Z) InterfaceTypeDeserializationCluster();
     case ModuleSnapshot::kFunctionTypes:

runtime/vm/raw_object.h

@@ -63,6 +63,7 @@ class SetDeserializationCluster;
 class SubtypeTestCacheDeserializationCluster;
 class TypeArgumentsDeserializationCluster;
 class TypeParameterTypeDeserializationCluster;
+class TypeParametersDeserializationCluster;
 }  // namespace module_snapshot
 
 #define DEFINE_CONTAINS_COMPRESSED(type)                                       \
@@ -2951,6 +2952,7 @@ class UntaggedTypeParameters : public UntaggedObject {
   CompressedObjectPtr* to_snapshot(Snapshot::Kind kind) { return to(); }
 
   friend class Object;
+  friend class module_snapshot::TypeParametersDeserializationCluster;
 };
 
 class UntaggedAbstractType : public UntaggedInstance {