try_split lossage

[John Wehle]

An insn may have various characteristics (such as CONST_CALL_P,
INSN_ANNULLED_BRANCH_P, INSN_FROM_TARGET_P, RTX_FRAME_RELATED_P)
which affect code generation.  try_split attempts to replace the
insn with other insn(s).  What isn't clear to me is how the new
insn(s) inherit the characteristics of the insn which is being
replaced.  

Should try_split either abort or avoid splitting insns which
have any of these characteristics?

-- John
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