Update to OWNERS in src/compiler

* Set gdeepti@ as a compiler backend owner.
* Set sigurds@ as a compiler owner.

Change-Id: I0ceb300b6452a36a7f945e92193a3946604c4e51
Reviewed-on: https://chromium-review.googlesource.com/878542Reviewed-by: Ben Titzer <titzer@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Brad Nelson <bradnelson@chromium.org>
Commit-Queue: Brad Nelson <bradnelson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50777}

src/compiler/OWNERS

@@ -5,16 +5,16 @@ jarin@chromium.org
 mstarzinger@chromium.org
 titzer@chromium.org
 danno@chromium.org
+sigurds@chromium.org
 tebbi@chromium.org
 neis@chromium.org
 mvstanton@chromium.org
 
 # For backend
 bbudge@chromium.org
-mtrofin@chromium.org
+gdeepti@chromium.org
 
 per-file wasm-*=ahaas@chromium.org
-per-file wasm-*=bbudge@chromium.org
 per-file wasm-*=bradnelson@chromium.org
 per-file wasm-*=clemensh@chromium.org