(common_type): Use TYPE_MAIN_VARIANT when preferring
long int to int (when width is the same). (check_format): With -Wformat, warn about printf("%ld", 1) even if sizeof (int) == sizeof (long), since the code isn't portable. Similarly for "%d" vs 1L. (convert_arguments) [PROMOTE_PROTOTYPES]: With -Wconversion, use unpromoted type to check for signedness changes. From-SVN: r4935
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