Fix 'Information Object Set XXX contains no objects' when parsing S1AP's ASN.1
The aforementioned error message displayed during processing the following ASN.1 excerpt. S1AP-ELEMENTARY-PROCEDURES S1AP-ELEMENTARY-PROCEDURE ::= { S1AP-ELEMENTARY-PROCEDURES-CLASS-1 | S1AP-ELEMENTARY-PROCEDURES-CLASS-2, ... } S1AP-ELEMENTARY-PROCEDURES-CLASS-1 S1AP-ELEMENTARY-PROCEDURE ::= { handoverPreparation | ... writeReplaceWarning, ..., uERadioCapabilityMatch | .... uEContextResume } S1AP-ELEMENTARY-PROCEDURES-CLASS-2 S1AP-ELEMENTARY-PROCEDURE ::= { handoverNotification | ... privateMessage, ..., downlinkUEAssociatedLPPaTransport | ... mMECPRelocationIndication } Because S1AP-ELEMENTARY-PROCEDURES-CLASS-1 and S1AP-ELEMENTARY-PROCEDURES-CLASS-2 are resolved 'after' S1AP-ELEMENTARY-PROCEDURES, so the ioc tables of them are not available during resolving S1AP-ELEMENTARY-PROCEDURES. So we can not drop the latter's containedSubtype field at first pass of asn1f_resolve_constraints of fix process. We also add second pass of asn1f_resolve_constraints to have a chance to combine ioc tables of S1AP-ELEMENTARY-PROCEDURES-CLASS-1 and S1AP-ELEMENTARY-PROCEDURES-CLASS-2.
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