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Add support for arm Ubuntu testing on hardware. Most JIT stress jobs are enabled.
GC stress jobs are not enabled currently (they haven't been tried yet).
Most jobs have both PR trigger jobs as well as weekly "cron" jobs.
Job frequency will be adjusted as we gain experience with the load.
Initially, there are no automatically triggered PR jobs, but I plan to add
one or more soon.
Moved existing arm Ubuntu (on emulator) and arm Tizen (on emulator)
to use new "armem" pseudo-architecture.
The arm Ubuntu jobs have the product cross-built on Ubuntu/x64 in Docker,
use tests built in a new Windows_NT x86 BuildOnly (`_bld`) job, and are run
on hardware after copying over all the correct artifacts.
Refactored lots of code related to determining if a particular combination
of os/architecture/configuration/isPR/etc. should create a job.
Refactored test/flow job creation.
runtest.sh now creates three files based on test results that can be fed
back to runtest.sh using the `--playlist` argument: coreclrtests.pass.txt,
coreclrtests.fail.txt, coreclrtests.skip.txt.
New script `runtesttilstable.sh` runs `runtest.sh` in a loop, rerunning failing
tests until no tests fail, or a maximum iteration count is reached (default: 4).
This works around existing issues with flaky test failures on Linux/arm32 hardware.
Some extraneous unused jobs have been removed, such as unused `_bld` jobs
and non-PR triggered `innerloop` jobs.
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