(In reply to Andy Wingo [:wingo] from comment #0)
Currently with ENABLE_BIGINT, there's a test failure in non262/reflect-parse/expression, in that a cache IC runs into an unexpected type. This is because there's no macroassembler support for bigint tests, and no IC support. This patch will fix it.
Make sure you Try server the ENABLE_BIGINT changes btw because we run tests there with --ion-eager/--baseline-eager/etc flags so it might uncover more stuff.