Quick compiler: handle embedded switch data

Although switch data is generally placed at the end of a dex
file by dx, it can occur elsewhere (and does via obsfucators).
This CL fixes a parsing error related to embedded switch data by
ensuring valid dex instructions following the embedded data appear
in their own basic blocks.

AOSP b/80600

Change-Id: I91ead6b398386bcf168b1088c5bc13a53b18f26e