Add back one left out compiler test to angle_unittests
Add back one left out compiler test to angle_unittests

VariablePacker_test.cpp

The other one UnrollFlatten_test.cpp crashes.

BUG=
TEST=angle_unittests

Change-Id: I78e6e81e9b61f2a1599a5a0601b5b76165b180de
Reviewed-on: https://chromium-review.googlesource.com/295767
Reviewed-by: Zhenyao Mo <655bdf1d95ff956cd68886dd9e86ee5e987c9dbb@chromium.org>
Tested-by: Zhenyao Mo <655bdf1d95ff956cd68886dd9e86ee5e987c9dbb@chromium.org>

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