[LLVM] Add maintainers for SandboxIR and SandboxVectorizer

Author: nikic

llvm/Maintainers.md

@@ -66,6 +66,13 @@ [email protected] (email), [qcolombet](https://github.com/qcolombet) (G
 Florian Hahn \
 [email protected] (email), [fhahn](https://github.com/fhahn) (GitHub)
 
+#### SandboxVectorizer
+
+Vasileios Porpodas \
+[email protected] (email), [vporpo](https://github.com/vporpo) (GitHub)
+Jorge Gorbe Moya \
+[email protected] (email), [slackito](https://github.com/slackito) (GitHub)
+
 #### ScalarEvolution, IndVarSimplify
 
 Philip Reames \
@@ -303,6 +310,13 @@ [email protected] (email), [pcc](https://github.com/pcc) (GitHub)
 Lang Hames \
 [email protected] (email), [lhames](https://github.com/lhames) (GitHub)
 
+#### SandboxIR
+
+Vasileios Porpodas \
+[email protected] (email), [vporpo](https://github.com/vporpo) (GitHub)
+Jorge Gorbe Moya \
+[email protected] (email), [slackito](https://github.com/slackito) (GitHub)
+
 #### TableGen
 
 Paul C. Anagnostopoulos \