[Bug tree-optimization/54981] [4.8 Regression] Different code generated with / without `-g'

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54981

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> 2012-10-19 11:06:16 UTC ---
+not generating builtin, partition has scalar uses outside of the loop

that check is confused by debug stmts.

I have a simple patch, let's watch for the fallout (the issue is surely
latent on the branches).