[compiler] Make ahaas@ and clemensh@ owners for wasm-*

R=titzer@chromium.org, mstarzinger@chromium.org
CC=ahaas@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2727863003
Cr-Commit-Position: refs/heads/master@{#43532}

src/compiler/OWNERS

@@ -7,3 +7,6 @@ mstarzinger@chromium.org
 mtrofin@chromium.org
 titzer@chromium.org
 danno@chromium.org
+
+per-file wasm-*=ahaas@chromium.org
+per-file wasm-*=clemensh@chromium.org