This change shouldn't affect anything except for the "Linux benchmarks" LUCI post-submit bot.

We'll closely monitor the LUCI bot to see if this works as intended. If so, we'll continue the migration in Cocoon (https://github.com/flutter/cocoon/pull/1062) to cut the dependency on the old Cocoon datastore and Tong's desktop.

Related issue: https://github.com/flutter/flutter/issues/73872

This reverts commit d4a73583.

* Print compile error

* Better comment

* Update run_tests.py

Setting `FLUTTER_GOMA_CREATE_XCODE_SYMLINKS=1` as an environment variable should
achieve the same result as manually specifying the `--xcode-symlinks` flag
(which I often forget). This is in keeping with the pattern of setting the
`GOMA_DIR` environment variable. The variable has a the `FLUTTER_` prefix
because environment variable with the `GOMA_` prefix are reserved for use by
Goma and variable unknown to Goma will cause a fatal error.

https://skia.googlesource.com/skia.git/+log/26a84431ff72..bde06cc511d2

2021-01-19 fmalita@chromium.org [svg] Cleanup: drop the presentation attribute SkPaint cache
2021-01-19 bungeman@google.com Avoid division by zero when shaping.
2021-01-19 bsalomon@google.com Revert "Test all YUVA image factories with different encoded origins."
2021-01-19 reed@google.com Add query to test our cached convexity
2021-01-19 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ANGLE from 68635b431b3c to 81430e11c81e (12 revisions)
2021-01-19 skia-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from 149733cead63 to 8da0f82baf35 (2 revisions)
2021-01-19 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Chromium from 1d3066a6e2ec to 00da91bbde3d (227 revisions)
2021-01-19 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Dawn from 04772515a8b6 to e45593cb0876 (4 revisions)
2021-01-18 reed@google.com Remove legacy code from picture-shader
2021-01-18 skia-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from aedd133cd85f to 149733cead63 (2 revisions)
2021-01-18 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ANGLE from 50c82f42e33f to 68635b431b3c (24 revisions)
2021-01-18 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Chromium from e330bc98d133 to 1d3066a6e2ec (498 revisions)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC scroggo@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/fuchsia-mac-sdk-flutter-engine
Please CC cbracken@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

https://dart.googlesource.com/sdk.git/+log/091e9f17809e..c4214e6daaac

2021-01-18 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.12.0-240.0.dev
2021-01-18 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.12.0-239.0.dev
2021-01-18 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.12.0-238.0.dev

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dart-sdk-flutter-engine
Please CC dart-vm-team@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

https://skia.googlesource.com/skia.git/+log/05e5446145a6..26a84431ff72

2021-01-18 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Dawn from 5a6fda1a6fcc to 04772515a8b6 (5 revisions)
2021-01-17 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update SKP version

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC scroggo@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md