Drop hoisted tags in 'base' states duplicated by tunneling.

Drop hoisted tags in 'base' states duplicated by tunneling.

Tunneling optimization finds certain states and splits them into
two parts: First part consumes a character and unconditionally moves
to the second part. Second part does not consume characters, but
contains a switch on character value.

Second part is a 'base switch', which may be utilized by many other
states. So if the first part has hoisted tags, they should be dropped
in the second part (the aforementioned many other states may have hoisted
tags of there own or no hoisted tags at all).

Found by slyfox's fuzzer. :)

Yet unable to construct a test case that reveals the error: the original
test case found by fuzzer is not breaking anymore after recent commit
44045203c211531cc3e3a47f0b5eb2e5d993cc15 "Properly remove useless final states.".