[SH] PR 39423

[Oleg Endo]

Hello,

The attached patch adds the combine patterns as discussed in the PR.
Tested on rev 189916 with
make -k check RUNTESTFLAGS="--target_board=sh-sim
\{-m2/-ml,-m2/-mb,-m2a/-mb,-m2a-single/-mb,-m4/-ml,-m4/-mb,
-m4-single/-ml,-m4-single/-mb,-m4a-single/-ml,-m4a-single/-mb}"

and no new failures.
Test cases will follow in a separate patch.

Cheers,
Oleg

ChangeLog
	PR target/39423
	* config/gcc/sh/sh.md (*movsi_index_disp, *movhi_index_disp):
	New insns.
	
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