[vta,vta4.3] skip debug insns when computing crossjump split points

[Alexandre Oliva]

-fcompare-debug let me know that NOTEs sometimes ended up in different
BBs because of debug insns, in crossjumping.  I don't see that this
could modify the generated code, but it's much easier if
-fcompare-debug doesn't have to ignore this kind of difference.

This patch avoids the differences in the first place.  The same patch
applies in both vta and vta4.3 branches.

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-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}
FSFLA Board Member       ?S? Libre! => http://www.fsfla.org/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}