Re-apply "Test if using one more fork on the bots makes a improvement in time to run"

This reverts commit 54653a60afcdc9c3fcb9a2befd94efacd63b21b0.

Fixed up internal test to reserve more cores per test runner to not go OOM on internal (memory hungry) tests

Change-Id: I2503f5eb708645845306280b57e86175014e655c
diff --git a/tools/internal_test.py b/tools/internal_test.py
index a9a90eb..5209b5b 100755
--- a/tools/internal_test.py
+++ b/tools/internal_test.py
@@ -304,7 +304,7 @@
   log('Running once with hash %s' % git_hash)
   env = os.environ.copy()
   # Bot does not have a lot of memory.
-  env['R8_GRADLE_CORES_PER_FORK'] = '8'
+  env['R8_GRADLE_CORES_PER_FORK'] = '16'
   failed = any([execute(cmd, archive, env) for cmd in TEST_COMMANDS])
   archive_status(1 if failed else 0)
   return failed