[Bug regression/46931] [4.6 Regression] Subversion id 167184 breaks building perlbench on power7 with debug

[aoliva at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46931

--- Comment #6 from Alexandre Oliva <aoliva at gcc dot gnu.org> 2010-12-17 06:23:19 UTC ---
Created attachment 22793
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22793
Patch I'm testing that fixes the bug

Instead of just dropping the debug info on the floor, I figured we could
preserve the RHS of the removed DEF, if unchanging, in the debug stmts
themselves, if this wouldn't create invalid RHS for the debug bind, or in debug
temps bound just before the using debug stmts otherwise.