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

[rth at gcc dot gnu.org]

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

--- Comment #19 from Richard Henderson <rth at gcc dot gnu.org> ---
Created attachment 32311
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32311&action=edit
proposed patch

Running full tests on this overnight, but it fixes the ICE.