AIX: Failure to Apply April 2019 Grid Infrastructure Release Update on 12.2 Oracle Restart Home

Environment

  Operation System:  IBM AIX 7.2 on POWER Systems (64-bit)
  Oracle Restart Home:  12.2.0.1 with July 2018 Grid Infrastructure Release Update (GI RU 12.2.0.1.180717)
  OPatch Version: 12.2.0.1.17

Symptoms
 
Opatch reported following errors while applying sub-patch 29314424 (OCW Apr 2019 Release Update 12.2.0.1.190416)

UtilSession failed: ApplySession failed in system modification phase... 'ApplySession::apply failed: java.lang.UnsatisfiedLinkError: /u01/app/grid/product/12.2.0/grid/lib/libpatchgensh12.so (rtld: 0712-001 Symbol nzos_SetServerNameList was referenced
      from module /u01/app/grid/product/12.2.0/grid/lib/libhasgen12.so(), but a runtime definition
      of the symbol was not found.
rtld: 0712-001 Symbol lxkRegexpComp2 was referenced
      from module /u01/app/grid/product/12.2.0/grid/lib/libhasgen12.so(), but a runtime definition
      of the symbol was not found.
rtld: 0712-001 Symbol lxkRegexpLike2 was referenced
      from module /u01/app/grid/product/12.2.0/grid/lib/libhasgen12.so(), but a ru)

Workaround

Apply Oct 2018 Grid Infrastructure Release Update (GI RU) first, then apply April 2019 GI RU.