This is skipped only on arm memory limited platforms. Until recently it was not a problem on MIPS as the butterfly was not initialized. But since r227435, the butterfly is initialized in that test and therefore memory is allocated, and the test typically takes around 512M, which means it generally gets OOM-killed on the MIPS buildbot.
Created attachment 332922 [details]
Patch skipping the test.
Comment on attachment 332922 [details]
Clearing flags on attachment: 332922
Committed r228011: <https://trac.webkit.org/changeset/228011>
All reviewed patches have been landed. Closing bug.