[SH][committed] PR 53987 - Add some known to work tests

[Oleg Endo]

Hi,

This adds some known to work SH tests for PR 53987.
Tested with
make -k check-gcc RUNTESTFLAGS="sh.exp=pr53987-1.c --target_board=sh-sim
\{-m2/-ml,-m2/-mb,-m2a/-mb,-m4/-ml,-m4/-mb,-m4a/-ml,-m4a/-mb}"
Committed as r219110.

Cheers,
Oleg

gcc/testsuite/ChangeLog:
	PR target/53987
	* gcc.target/sh/pr53987-1.c: New.
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