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R8 has now added support (b/122902374) for this, fixing a few
outstanding bugs related to class merging. This also makes build rules
a bit simpler.

Still need to switch Trichrome synchronized proguard over to using
R8 for dexsplitting, then we can remove dexsplitter support entirely.

This CL updates R8 with another patch, but does not change the R8
base version used.

Binary-Size: R8 patch now keeping extra methods.
Bug: 1032609
Change-Id: I79f88736c20d96b718eb129cdbd093fe1cd297b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2014309
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735315}