[gold] Fix integer narrowing in switch

gold/
	* target.h (Sized_target::record_gnu_property): Use unsigned int
	for second argument.
	* x86_64.cc (Target_x86_64<size>::record_gnu_property): Likewise.

(cherry picked from commit ccaf6a01bae457aba3a3f6baf1239bb55bc189a4)
3 files changed