This hopefully reduces compilation time which is accounting
for more than 70% of running time of presubmit tests on Kokoro.

Change-Id: I3e6e0505c247f71589ceba009b38e17bf03acb39
ORIGINAL_AUTHOR=Thai Duong <thaidn@google.com>
GitOrigin-RevId: dc2cb661d02b1fe045b6785bb6e62182d1d04b5e