Use correct class when reviving from a static field (#546)

Fixes #533

Previously when searching for a static field matching a constant object
we would use the class name from the type of the object always instead
of the class name in which we found the field. This worked in many cases
because constant static fields intended for use in other libraries are
more often defined on the same class as their type.

source_gen/lib/src/constants/revive.dart

@@ -65,15 +65,16 @@ Revivable reviveInstance(DartObject object, [LibraryElement? origin]) {
   }
 
   // ignore: deprecated_member_use
-  for (final e in origin!.definingCompilationUnit.types
-      .expand((t) => t.fields)
-      .where((f) => f.isConst && f.computeConstantValue() == object)) {
-    final result = Revivable._(
-      source: url.removeFragment(),
-      accessor: '${clazz.name}.${e.name}',
-    );
-    if (tryResult(result)) {
-      return result;
+  for (final type in origin!.definingCompilationUnit.types) {
+    for (final e in type.fields
+        .where((f) => f.isConst && f.computeConstantValue() == object)) {
+      final result = Revivable._(
+        source: url.removeFragment(),
+        accessor: '${type.name}.${e.name}',
+      );
+      if (tryResult(result)) {
+        return result;
+      }
     }
   }
   final i = (object as DartObjectImpl).getInvocation();

source_gen/test/constants_test.dart

@@ -218,8 +218,8 @@ void main() {
         @Wrapper(_privateFunction)
         class Example {}
 
-        class Int64Like {
-          static const Int64Like ZERO = const Int64Like._bits(0, 0, 0);
+        class Int64Like implements Int64LikeBase{
+          static const Int64Like ZERO = const Int64LikeBase._bits(0, 0, 0);
 
           final int _l;
           final int _m;
@@ -228,6 +228,14 @@ void main() {
           const Int64Like._bits(this._l, this._m, this._h);
         }
 
+        class Int64LikeBase {
+          final int _l;
+          final int _m;
+          final int _h;
+
+          const Int64LikeBase._bits(this._l, this._m, this._h);
+        }
+
         enum Enum {
           field1,
           field2,