[1/2] Make regrename callable from target reorg code

[Bernd Schmidt]

The main purpose of this patch is to move some declarations to a new
file, regrename.h, and make regrename_analyze and do_replace callable
from elsewhere. The second patch will add code to c6x.c to make use of
this from the modulo-scheduling code.

This also adds a small amount of new functionality: regrename can now
record data for each insn about which chains occur in the operands.

Now testing on c6x-elf; an i686-linux bootstrap with regrenaming enabled
at -O1 completed. The patch has also been in our 4.5 tree for a while
now. Ok?


Bernd
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