Prevent SRA from removing type changing assignment

Prevent SRA from removing type changing assignment

2017-12-08  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/83141
	* tree-sra.c (contains_vce_or_bfcref_p): Move up in the file, also
	test for MEM_REFs implicitely changing types with padding.  Remove
	inline keyword.
	(build_accesses_from_assign): Added contains_vce_or_bfcref_p checks.

testsuite/
	* gcc.dg/tree-ssa/pr83141.c: New test.
	* gcc.dg/guality/pr54970.c: XFAIL tests querying a[0].

From-SVN: r255510