Reserve more RAM per Gold process.
Reserve more RAM per Gold process.

The current settings are too agressive even given the fact that
all the bots have 200+ GB RAM, and there's not so many large targets.
OOMs were observed:
https://build.chromium.org/p/chromium.fyi/builders/LTO%20Linux/builds/500

BUG=453195

Review-Url: https://codereview.chromium.org/1989083003
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#394423}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk