Ping my recent patches

[François-Xavier Coudert]

*ping* these three patches: one wrong-code, one
diagnostic/accepts-invalid, and one missed-optimization.


Don't evaluate substring bounds multiple times:
http://gcc.gnu.org/ml/gcc-patches/2007-05/msg00391.html

Bounds-checking for lower bound of last dimension of assumed-size
array: http://gcc.gnu.org/ml/gcc-patches/2007-05/msg00405.html

We don't need libgfortran wrappers for malloc and free:
http://gcc.gnu.org/ml/gcc-patches/2007-05/msg00404.html