[compiler] Add owners of machine-operator.* and opcodes.*

Change-Id: I6df71e7bbbcd726816826693b43d4acf30af21d2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2667186Reviewed-by: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72543}

src/compiler/OWNERS

@@ -17,6 +17,16 @@ per-file wasm-*=jkummerow@chromium.org
 
 per-file int64-lowering.*=ahaas@chromium.org
 
+per-file machine-operator.*=ahaas@chromium.org
+per-file machine-operator.*=bbudge@chromium.org
+per-file machine-operator.*=gdeepti@chromium.org
+per-file machine-operator.*=zhin@chromium.org
+
+per-file opcodes.*=ahaas@chromium.org
+per-file opcodes.*=bbudge@chromium.org
+per-file opcodes.*=gdeepti@chromium.org
+per-file opcodes.*=zhin@chromium.org
+
 per-file simd-scalar-lowering.*=bbudge@chromium.org
 per-file simd-scalar-lowering.*=gdeepti@chromium.org
 per-file simd-scalar-lowering.*=zhin@chromium.org