[SH, committeð] PR 60884 - reduce code size of inlined strlen

[Oleg Endo]

Hi,

The attached patch reduces the code size of inlined builtin strlen
functions on SH a little bit.
Tested on r210083 with
make -k check RUNTESTFLAGS="--target_board=sh-sim
\{-m2/-ml,-m2/-mb,-m2a/-mb,-m4/-ml,-m4/-mb,-m4a/-ml,-m4a/-mb}"

and no new failures, except for gcc.target/sh/pr53976-1.c on SH2 and
SH2A.  Using builtin strlen for checking the sett/clrt optimization pass
was a bit inappropriate in this case.

Committed as r210187.

Cheers,
Oleg

gcc/ChangeLog:
	PR target/60884
	* config/sh/sh-mem.cc (sh_expand_strlen): Use loop when emitting
	unrolled byte insns.  Emit address increments after move insns.

gcc/testsuite/ChangeLog:
	PR target/60884
	* gcc.target/sh/pr53976-1.c (test_02): Remove inappropriate test case.
	(test_03): Rename to test_02.
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