some prep work to make JUMP_TABLE_DATA a non-active_insn_p object

[Steven Bosscher <stevenb dot gcc at gmail dot com>]

Hello,

I'd like to make JUMP_TABLE_DATA a non-active insn before the end of
stage1. Most of the work required for this is pretty simple. It
involves finding and fixing the few places where insns are walked
across basic block boundaries and ignoring barriers. Ah, the madness
of that! :-) Fortunately almost no code does this in the shared RTL
middle end, and most targets are also safe.

This is the first patch of what I think will be four to fix those few places.

Bootstrapped&tested on powerpc64-unknown-linux-gnu. Also built SH to be sure.

OK for trunk?

Ciao!
Steven

Attachment: active_insn_cleanup_1.diff.txt
Description: Text document