PR target/82112
	* config/rs6000/rs6000-c.c (altivec_resolve_overloaded_builtin): For
	ALTIVEC_BUILTIN_VEC_LD if arg1 has array type call default_conversion
	on it early, rather than manual conversion late.  For
	ALTIVEC_BUILTIN_VEC_ST if arg2 has array type call default_conversion
	instead of performing manual conversion.

	* gcc.target/powerpc/pr82112.c: New test.
	* g++.dg/ext/altivec-18.C: New test.

From-SVN: r252028