Revert: completely_scalarize arrays as well as records

Revert: completely_scalarize arrays as well as records

gcc/:
	Revert:
	2015-08-27  Alan Lawrence  <alan.lawrence@arm.com>
		PR tree-optimization/67283
		* tree-sra.c (type_consists_of_records_p): Rename to...
		(scalarizable_type_p): ...this, add case for ARRAY_TYPE.

		(completely_scalarize_record): Rename to...
		(completely_scalarize): ...this, add ARRAY_TYPE case, move some
		 code to:
		(scalarize_elem): New.

gcc/testsuite/:

	Revert:
	2015-08-27  Alan Lawrence  <alan.lawrence@arm.com>
		* gcc.dg/tree-ssa/sra-15.c: New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@227303 138bc75d-0d04-0410-961f-82ee72b054a4