resolve top level var used as yul identifiers

slither/solc_parsing/yul/parse_yul.py

@@ -35,6 +35,7 @@ from slither.solc_parsing.yul.evm_functions import (
     unary_ops,
     binary_ops,
 )
+from slither.solc_parsing.expressions.find_variable import _find_top_level
 from slither.visitors.expression.find_calls import FindCalls
 from slither.visitors.expression.read_var import ReadVar
 from slither.visitors.expression.write_var import WriteVar
@@ -797,6 +798,10 @@ def parse_yul_identifier(root: YulScope, _node: YulNode, ast: Dict) -> Optional[
     if magic_suffix:
         return magic_suffix
 
+    ret, _ = _find_top_level(name, root._contract.file_scope)
+    if ret:
+        return Identifier(ret)
+
     raise SlitherException(f"unresolved reference to identifier {name}")