[ping] 5 unreviewed patches

[Eric Botcazou]

Fix annoying gcov filename handling: (2 lines)
  http://gcc.gnu.org/ml/gcc-patches/2011-03/msg01380.html

Introduce -Wstack-usage:
  http://gcc.gnu.org/ml/gcc-patches/2011-03/msg01992.html

Extend TYPE_DECL_IS_STUB trick in dwarf2out.c: (1 line)
  http://gcc.gnu.org/ml/gcc-patches/2011-04/msg00683.html

Emit DW_AT_artificial for types:
  http://gcc.gnu.org/ml/gcc-patches/2011-04/msg00700.html

Fix PR lto/48492 (bis): (1 line)
  http://gcc.gnu.org/ml/gcc-patches/2011-04/msg01461.html

Thanks in advance.

-- 
Eric Botcazou