Don't attempt to generate errors for unpromoted types in va_arg(), since it is impossible to distinguish unpromoted types from small (struct) types.  Renamed __va_promote() to __va_size() since it is related to sizes of args on the stack and not to promotion.
Don't attempt to generate errors for unpromoted types in va_arg(),
since it is impossible to distinguish unpromoted types from small
(struct) types.  Renamed __va_promote() to __va_size() since it is
related to sizes of args on the stack and not to promotion.

PR:		3884
Submitted by:	mostly by arnej@math.ntnu.no (Arne Henrik Juul)
Obtained from:	name of__va_size and some parentheses fixes from NetBSD

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