[compiler] Add missing "break" in switch statement

AFAICT this doesn't currently change observable behavior, but should
be fixed nonetheless.

Change-Id: I1dce90ae5bcad39d7d54dddd2559bd7f7ccbb095
Reviewed-on: https://chromium-review.googlesource.com/648354Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47835}

src/compiler/bytecode-analysis.cc

@@ -159,6 +159,7 @@ void UpdateInLiveness(Bytecode bytecode, BytecodeLivenessState& in_liveness,
             in_liveness.MarkRegisterLive(r.index() + j);
           }
         }
+        break;
       }
       default:
         DCHECK(!Bytecodes::IsRegisterInputOperandType(operand_types[i]));