[committed] [PR tree-optimization/92788] Check right edge flags when suppressing jump threading

[Jeff Law <law at redhat dot com>]

When we thread through the successor of a joiner block we make a clone
of the joiner block and redirect its outgoing edges.  Of course if
there's cases where we can't redirect an edge, then bad things will
happen.

The code already checked for EDGE_ABNORMAL to suppress threading in
that case.  But it really should have been checking EDGE_COMPLEX which
includes ABNORMAL_CALL, EH and PRESERVE.

This patch fixes that oversight and resolves the BZ.  Bootstrapped and
regression tested on x86_64.  Committed to the trunk.

jeff

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