[SH][committed] Fix gcc.target/sh/pr54236-1.c failures

[Oleg Endo]

Hi,

Since the recent changes in combine w.r.t. canonical forms of ashift and
mult outside mems, some of the SH patterns stopped working.  The
attached patch fixes the failures in gcc.target/sh/pr54236-1.c.

Tested briefly with
make -k check-gcc RUNTESTFLAGS="sh.exp --target_board=sh-sim
\{-m2/-ml,-m2/-mb,-m2a/-mb,-m4/-ml,-m4/-mb,-m4a/-ml,-m4a/-mb}"

Committed as r223274.

Cheers,
Oleg

gcc/ChangeLog:
	PR target/54236
	* config/sh/sh.md (*addc_2r_t): Use ashift instead of mult.
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