[Prism] Implement defined? for PM_CALL_OR_WRITE_NODE

Ruby code:

```ruby
defined?(PrismTestSubclass.test_call_or_write_node ||= 1)
```

Instructions:

```
"********* Ruby *************"
== disasm: #<ISeq:<compiled>@<compiled>:1 (1,0)-(59,58)>
0000 putobject                              "assignment"              (  59)[Li]
0002 leave
"********* PRISM *************"
== disasm: #<ISeq:<compiled>@<compiled>:58 (58,0)-(58,58)>
0000 putobject                              "assignment"              (  58)[Li]
0002 leave
```

Related: ruby/prism#2188

prism_compile.c

@@ -2688,6 +2688,7 @@ pm_compile_defined_expr0(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *co
         return;
       case PM_CALL_AND_WRITE_NODE:
       case PM_CALL_OPERATOR_WRITE_NODE:
+      case PM_CALL_OR_WRITE_NODE:
 
       case PM_CONSTANT_WRITE_NODE:
       case PM_CONSTANT_OPERATOR_WRITE_NODE:

test/ruby/test_compile_prism.rb

@@ -240,6 +240,7 @@ module Prism
 
       assert_prism_eval("defined?(PrismTestSubclass.test_call_and_write_node &&= 1)")
       assert_prism_eval("defined?(PrismTestSubclass.test_call_operator_write_node += 1)")
+      assert_prism_eval("defined?(PrismTestSubclass.test_call_or_write_node ||= 1)")
     end
 
     def test_GlobalVariableReadNode