The tests currently depending on memcpy lowering forming stps at -O0,
but we no longer want to form stps during memcpy lowering, but instead
in the load/store pair fusion pass.

This patch therefore tweaks affected tests to enable optimizations
(-O1), and adjusts the tests to avoid parts of the structures being
optimized away where necessary.

OK for trunk?

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/auto-init-padding-1.c: Add -O to options,
	adjust test to work with optimizations enabled.
	* gcc.target/aarch64/auto-init-padding-2.c: Add -O to options.
	* gcc.target/aarch64/auto-init-padding-3.c: Add -O to options,
	adjust test to work with optimizations enabled.
	* gcc.target/aarch64/auto-init-padding-4.c: Likewise.
	* gcc.target/aarch64/auto-init-padding-9.c: Likewise.
---
 gcc/testsuite/gcc.target/aarch64/auto-init-padding-1.c | 8 +++++---
 gcc/testsuite/gcc.target/aarch64/auto-init-padding-2.c | 2 +-
 gcc/testsuite/gcc.target/aarch64/auto-init-padding-3.c | 7 ++++---
 gcc/testsuite/gcc.target/aarch64/auto-init-padding-4.c | 4 ++--
 gcc/testsuite/gcc.target/aarch64/auto-init-padding-9.c | 7 ++++---
 5 files changed, 16 insertions(+), 12 deletions(-)