[SH] PR 53568 - some bswap32 test cases

[Oleg Endo]

Hello,

The attached patch adds a few bswap32 test cases for SH.
Tested against rev 189175 with 
make -k check RUNTESTFLAGS="sh.exp=pr53568-1.c --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}"

to make sure that the test case passes.

Cheers,
Oleg

testsuite/ChangeLog:

	PR target/53568
	* gcc.target/sh/pr53568-1.c: New.
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