Increase the number of concurrent link when symbol_level is less than 2

This is mainly for compile step time improve for android-kitkat-arm-rel builder
having symbol_level=1

I measured peak memory usage when link some large targets with android-kitkat-arm-rel builder's config.

libchrome.so: 4776232 KB
lib_unit_tests__library.so: 5308156 KB
lib_components_unittests__library.so: 5383500 KB

So 6GB will be sufficient for such builder. This also increase parallelism of proguard steps too.

Bug: 804251
Change-Id: I7e8785ae3f14d8ba1f45da532585d7c61875d321
Reviewed-on: https://chromium-review.googlesource.com/1104280
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#569237}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 7dcf98f916babd3eae8f330824fcecdf97bd175c
1 file changed