[PR 89209] Avoid segfault in a peculiar corner case in SRA

[PR 89209] Avoid segfault in a peculiar corner case in SRA

2019-02-18  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/89209
	* tree-sra.c (create_access_replacement): New optional parameter
	reg_tree.  Use it as a type if non-NULL and access type is not of
	a register type.
	(get_repl_default_def_ssa_name): New parameter REG_TYPE, pass it
	to create_access_replacement.
	(sra_modify_assign): Pass LHS type to get_repl_default_def_ssa_name.
	Check lacc is non-NULL before attempting to re-create it on the RHS.

	testsuite/
	* gcc.dg/tree-ssa/pr89209.c: New test.

From-SVN: r268980