[Compiler] Add Santiago to compiler OWNERS

Change-Id: I8ae417b5f3bd2e19bbddc841bcd99044b8d14467
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2485090Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Auto-Submit: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70727}

src/compiler/OWNERS

@@ -7,6 +7,7 @@ mvstanton@chromium.org
 mslekova@chromium.org
 jgruber@chromium.org
 nicohartmann@chromium.org
+solanes@chromium.org
 
 per-file wasm-*=ahaas@chromium.org
 per-file wasm-*=bbudge@chromium.org