[PATCH, S390] Increase function alignment to 16 bytes

[Robin Dapp]

Hi,

> Please skip '+Â Â Â Â Â  && !opts->x_optimize_size)'. I'm attaching patch
> that will
> set opts->x_flag_align_functions to 0 for -Os. It's part of another batch
> alignment patches I'm preparing.

done in the attached version and added some tests (which do not all fail
without the patch as we can get lucky with the alignment).

Regtested on s390x.

Regards
 Robin

--

gcc/ChangeLog:

2018-07-12  Robin Dapp  <rdapp@linux.ibm.com>

	* config/s390/s390.c (s390_default_align): Set default function
	alignment to 16.
	(s390_override_options_after_change): Call s390_default align.
	(s390_option_override_internal): Call s390_default_align.
	(TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE): Define.

gcc/testsuite/ChangeLog:

2018-07-12  Robin Dapp  <rdapp@linux.ibm.com>

	* gcc.target/s390/function-align1.c: New test.
	* gcc.target/s390/function-align2.c: New test.
	* gcc.target/s390/function-align3.c: New test.
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