[committed] rewrite of last cfgrtl.c patch

[James E Wilson]

My fix for PR 17356 was bothering me, as I didn't fully understand the
code before I changed it.  So I went back and took another closer look,
and figured out that my first patch wasn't completely correct.  This
removes my previous patch, and just adds two new lines
!             && (! (e->flags & EDGE_ABNORMAL_CALL)
!                 || CALL_P (BB_END (bb))))
This fixes the original problem where we weren't removing abnormal call
EH edges for blocks that needed an EH edge, but did not end with a
CALL_INSN.  I also added comments, to explain the part I didn't not
understand the first time I looked at this code.

This was tested with an ia64-linux bootstrap and make check for all
default languages plus Ada.  There were no regressions.
-- 
Jim Wilson, GNU Tools Support, http://www.specifix.com
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