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.

b/18524584

Change-Id: I815bb5ec939803f706f98beb3afbefc8b527f730