In order to be able to land SwANGLE in Chromium, this cl adds
suppressions for memory leaks detected by LSAN. Some of these should
be fixed and some are intentional leaks of global variables.

This cl should allow the linux_chromium_asan_rel_ng bot to pass while
using SwANGLE and shouldn't break the win-libfuzzer-asan-rel bot.

Bug: chromium:972686
Bug: angleproject:5377
Change-Id: I7e2336aba43fcfeb95716d6c0aa05caf855134aa
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2575200Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Alexis Hétu <sugoi@chromium.org>