[SH][committed] FIx PR 67657

[Oleg Endo]

Hi,

This fixes PR 67657 on trunk.  It seems that something after the
peephole2 pass is not happy to see things like:
     mov.l   @r2+,r2

which some of the SH peephole2 patterns create out of e.g.
    mov.l   @r2+,r0
    mov     r0,r2

The post-inc is a bit pointless, so this patch catches such cases and
replaces the address in the mem with a non-post-inc address.

Tested on sh-elf with
make -k check RUNTESTFLAGS="--target_board=sh-sim
\{-m2/-ml,-m2/-mb,-m2a/-mb,-m4/-ml,-m4/-mb,-m4a/-ml,-m4a/-mb}"

Committed as r227969.
A backport to GCC 5 will follow.

Cheers,
Oleg

gcc/ChangeLog:
	PR target/67657
	* config/sh/sh.c (sh_remove_overlapping_post_inc,
	sh_peephole_emit_move_insn): Add new functions.
	* config/sh/sh-protos.h (sh_remove_overlapping_post_inc,
	sh_peephole_emit_move_insn): Declere them.
	* config/sh/sh.md: Use them in various peephole2 patterns.
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