OID produces incorrect results when top level argument is a pointer

[JakeHillion]

The top level pointer attribute is omitted when traced with OID. That is, the argument is treated as an argument of the underlying data type. For example:

Actual output:

[
  {
    "name": "a0",
    "typePath": "a0",
    "typeName": "int",
    "isTypedef": false,
    "staticSize": 4,
    "dynamicSize": 0
  }
]

Expected output:

[
  {
    "typeName": "int *",
    "staticSize": 8,
    "dynamicSize": 4,
    "pointer": XXX,
    "members": [
      {
        "typeName": "int",
        "staticSize": 4,
        "dynamicSize": 0
      }
    ]
  }
]

### Affected tests:

• OidIntegration.pointers_int
• OidIntegration.pointers_no_follow
• OidIntegration.pointers_int_null
• OidIntegration.pointers_void
• OidIntegration.pointers_void_no_follow
• OidIntegration.pointers_void_null
• OidIntegration.pointers_vector
• OidIntegration.pointers_vector_no_follow
• OidIntegration.pointers_vector_null

[JakeHillion]

• OidIntegration.pointers_void
• OidIntegration.pointers_void_no_follow
• OidIntegration.pointers_void_null

Are special cases of this. As oid codegen sees them as the underlying type (void when it should be void*) it hits: https://github.com/facebookexperimental/object-introspection/blob/1c3ee5bf6b79676bce4155284f3723de42b2227e/src/OICodeGen.cpp#L1025-L1028