A couple infrastructure changes went into this patch:
- test262 changed from expecting $ to $262
- upstream-local-tests.sh gets a command-line parameter for ease of use
- Fixed up the FAIL_SLOPPY infrastructure, which seems to have bit-rotted
- Inserted a terrible hack to get around test262 tests with a $ in the name

Drive-by fix for the length of Intl.DateTimeFormat.prototype.format

R=adamk

Review-Url: https://codereview.chromium.org/2733843002
Cr-Commit-Position: refs/heads/master@{#43749}