Fix compilation issue: use Symbols instead of SymUtils

Author: WojciechMazur

compiler/src/dotty/tools/dotc/transform/ExpandSAMs.scala

@@ -7,7 +7,7 @@ import Scopes.newScope
 import Contexts.*, Symbols.*, Types.*, Flags.*, Decorators.*, StdNames.*, Constants.*
 import MegaPhase.*
 import Names.TypeName
-import SymUtils.*
+import Symbols.*
 import NullOpsDecorator.*
 import ast.untpd