[Bug debug/60438] [4.9 Regression] dwarf2cfi :2239 still assert,not the same cause as PR 59575

[manjian2006 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60438

--- Comment #21 from linzj <manjian2006 at gmail dot com> ---
(In reply to Richard Henderson from comment #19)
> Created attachment 32311 [details]
> proposed patch
> 
> Running full tests on this overnight, but it fixes the ICE.

It just pass the tests & fixes the ICE.But it also generates worse code.cfa
pass does not combine the last pop insn with sp restoring insn!