Count switch as branch.

Rationale:
Builder heuristics bail for method without branches. A method with a
switch should not be discarded that easily.

Boot size delta (oat files, sailfish arm64): + 16488 bytes

Test: test-art-host,target
Bug: b/77652521
Change-Id: I6f90fcd65263e85024d8a268bcd8bfa739af2c6f