[c++] Keep tm, div_t, ldiv_t, lconv mangling on Solaris (PR libstdc++-v3/1773)

[Jason Merrill]

On 08/17/2011 09:06 AM, Rainer Orth wrote:
> +@deftypefn {Target Hook} tree TARGET_CXX_DECL_MANGLING_CONTEXT (const_tree @var{decl})
> +Return target-specific mangling context of @var{decl}.
> +@end deftypefn

This should say "or NULL_TREE".  Otherwise OK.

Jason