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This change reduces the size of the isolates generated for builds
on all platforms by only generating minimal symbols useful for
generating stack traces.

What we lose are the following:

- Full fidelity for core dumps in perf builds.

- Full debug information when stepping through a perf build.

What we gain though is much smaller binaries to download and test with.

R=agable@chromium.org, johnchen@chromium.org

Bug: chromium:1076723
Change-Id: Idd5198fe2a7afb9121c76bc1583a824174b8e737
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2174105
Commit-Queue: Dean Berris <dberris@chromium.org>
Auto-Submit: Dean Berris <dberris@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#765419}