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Re: Apply attribute returns_nonnull in libiberty


 	PR tree-optimization/58689
 	* ansidecl.h (ATTRIBUTE_RETURNS_NONNULL): New macro.
 	* libiberty.h (basename, lbasename, dos_lbasename, unix_lbasename,
 	concat_copy): Mark with attributes nonnull(1) and returns_nonnull.
 	(concat_copy2, xstrerror): Mark with attribute returns_nonnull.

This part is OK.


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