Fix PR97205

Fix PR97205

This makes sure that stack allocated SSA_NAMEs are
at least MODE_ALIGNED.  Also increase the MEM_ALIGN
for the corresponding rtl objects.

gcc:
2020-11-03  Bernd Edlinger  <bernd.edlinger@hotmail.de>

	PR target/97205
	* cfgexpand.c (align_local_variable): Make SSA_NAMEs
	at least MODE_ALIGNED.
	(expand_one_stack_var_at): Increase MEM_ALIGN for SSA_NAMEs.

gcc/testsuite:
2020-11-03  Bernd Edlinger  <bernd.edlinger@hotmail.de>

	PR target/97205
	* gcc.c-torture/compile/pr97205.c: New test.