[Bug target/48227] "rep ret" generated for -march=core2

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48227

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-12-15 
23:18:35 UTC ---
  /* X86_TUNE_PAD_RETURNS */
  m_CORE2I7 | m_AMD_MULTIPLE | m_GENERIC,


So we still do it for Core2 i7.