Bug 1765803: Mark HomeObjectSuperBase as movable. r=jandem

MHomeObjectSuperBase has the same semantics as MSuperFunction, but only the
latter is marked as movable and has a congruentTo override.

Differential Revision: https://phabricator.services.mozilla.com/D144300

js/src/jit/MIROps.yaml

@@ -1318,6 +1318,8 @@
   operands:
     homeObject: Object
   result_type: Value
+  movable: true
+  congruent_to: if_operands_equal
   alias_set: custom
 
 - name: GetPropSuperCache