Task "qunit:htmlminifier" failed and phantomJS crashed on Power machine

npm version : 5.10.0
node version : 8.9.4
phantomjs version : 2.1.1 (binary created from source code)

successfully working on X86 ubuntu.

But facing below issue on Power RHEL while "**npm test -f**":
>> Running "qunit:htmlminifier" (qunit) task
>> node completed in 453ms
>> 1623 of 1623 passed, 0 failed
>> 1 0x11cdc6bc /path/to/phantomjs/phantomjs() [0x11cdc6bc]
.
.
.
>> 29 0x125a6d5c /path/to/phantomjs/phantomjs() [0x125a6d5c]
>> 30 0x11d575b4 /path/to/phantomjs/phantomjs() [0x11d575b4]
>> 31 0x125453d0 /path/to/phantomjs/phantomjs() [0x125453d0]
>> PhantomJS has crashed.
>> web test failed to load
Warning: Task "qunit:htmlminifier" failed. Use --force to continue.
Aborted due to warnings.

Reproduce the failure with npm test -f on Power RHEL using Node 8.9.4, npm 5.10.0, and PhantomJS 2.1.1. Start with the qunit:htmlminifier task after confirming that all 1623 tests pass, then investigate why the PhantomJS web test crashes; done means the task completes without the crash on Power RHEL.

Written by the indexing model from the issue text.