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- Add '-Wl,-mllvm -Wl,-generate-type-units' to ldflags for Chrome
Android builds using ThinLTO (use_thin_lto), which is typically the case
just for official builds (is_official).
- This brings the 32bit binary size of Chrome under the linker size
limit, so symbol_level can be raised back to "2" for these builds.
- Exclude builds with ThinLTO from the logic that lowers symbol_level to
"1" for non-component Android builds.

Change-Id: I26457985b26d0e84bf08640c5128b84eacdcc43e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992240
Commit-Queue: Nelson Billing <nbilling@google.com>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729971}