* c-common.h (default_conversion): Remove.
(perform_integral_promotions): Add.
* c-tree.h (default_conversion): Add.
* c-typeck.c (perform_integral_promotions): New, split out from
default_conversion.
* c-common.c (check_case_value): Use perform_integral_promotions,
not default_conversion.
(c_add_case_label): Don't continue processing case label after
found to be pointer.