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Adds -Xmx1G to limit heap size to 1GB.

My local test of R8 on MonochromePublic.aab had a peak RSS
of 1.8GB with this flag and 8GB without it.

Does not seem to cause the command to run measurably slower.

I found that the r8 wrapper script in AOSP uses this same flag and
so does the Android lint wrapper script.

Bug: 1098333
Change-Id: Icca79bf6c1e9c8f003f613c178983f63cf9fbf04
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2348018
Commit-Queue: Sam Maier <smaier@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796806}