move warning_if_unused_value to c-common.c

[Manuel López-Ibáñez]

It is a C-family FE function, not sure how it ended up in stmt.c.

OK to commit?

Cheers,

Manuel.

Bootstrapped and regression tested with languages=all,ada,obj-c++

2012-04-10  Manuel López-Ibáñez  <m...@gcc.gnu.org>

        * c-family/c-common.c (warn_if_unused_valuer): Move definition to here.
        * tree.h (warn_if_unused_value): Move declaration from here.
        * c-family/c-common.h (warn_if_unused_value): Move declaration to here.
        * cp/cvt.c (convert_to_void): Update comment.
        * stmt.c (warn_if_unused_value): Move definition from here.

warning_if_unused.diff
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