re PR target/82703 (Wrong addition of std::array components with -O2 -ftree-loop...

re PR target/82703 (Wrong addition of std::array components with -O2 -ftree-loop-vectorize -ftree-slp-vectorize (works fine with -O2))

	PR target/82703
	* config/i386/i386-protos.h (maybe_get_pool_constant): Removed.
	* config/i386/i386.c (maybe_get_pool_constant): Removed.
	(ix86_split_to_parts): Use avoid_constant_pool_reference instead of
	maybe_get_pool_constant.
	* config/i386/predicates.md (zero_extended_scalar_load_operand):
	Likewise.

	* gcc.dg/pr82703.c: New test.

From-SVN: r254145