fix: remove bigint from lsr

Author: gwansikk

compiler/ml/unified_ops.ml

@@ -183,7 +183,7 @@ let entries =
           int = Plsrint;
           bool = None;
           float = None;
-          bigint = Some Pasrbigint;
+          bigint = None;
           string = None;
         };
     };

tests/tests/src/unified_ops_test.res

@@ -39,4 +39,3 @@ let rhs_shift = (a, b: int) => a << b
 let unknown_shift = (a, b) => a << b
 
 let shl_bigint = 1n << 2n
-let shr_bigint = 8n >> 2n