[SH][committed] Add PR 17280 test case

[Oleg Endo]

Hi,

This adds a test case for PR 17280.  Tested with
make -k check-gcc RUNTESTFLAGS="sh-torture.exp --target_board=sh-sim
\{-m2/-ml,-m2/-mb,-m2a/-mb,-m4/-ml,-m4/-mb,-m4a/-ml,-m4a/-mb}"
Committed as r218998.

Cheers,
Oleg

gcc/testsuite/ChangeLog:
	PR target/17280
	* gcc.target/sh/torture/pr17280.c: New.
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