[Bug tree-optimization/58005] missed optimization printf constant string

[joseph at codesourcery dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58005

--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot 
com> ---
Such an optimization can increase code size (well, the total size of 
string constants in the program) if the same format string is used with 
many different arguments, so it may not always be a good idea (at least 
with -Os).