Add XSAN suppression files to infrabots.isolate. Only compile 'dm' and 'nanobench' for XSAN flavors.

Needed for https://codereview.chromium.org/1920283002

BUG=skia:5157
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1859413003

Review-Url: https://codereview.chromium.org/1859413003
2 files changed