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- Make --gen/run-precompiled-snapshot take a directory to use for the snapshot pieces. - Throw on Platform.executeable to prevent tests from becoming fork-bombs. - Update status files so 'dart_precompiled' is generally expected to behave the same as 'vm'. Currently multitests will fail unless run with --jobs=1 because the test harness assigns them the same temporary directory. Running this also requires a great deal of space. My out directory is 380G. BUG=http://dartbug.com/24975 R=fschneider@google.com, srdjan@google.com Review URL: https://codereview.chromium.org/1507943002 .