[SH] Backport fix of PR 53988 to 4.9/4.8

[Oleg Endo]

Hi,

Backporting of the fix went into GCC 5 seems to intrusive for the
released branches.  Hence I'd propose to remove the problematic patterns
altogether, as they can silently generate wrong code.  The attached
patch does that.  Tested briefly with 'make all' and 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}"

Kaz, do you have any objections?

Cheers,
Oleg

gcc/ChangeLog:
	PR target/53988
	* config/sh/sh.md (*tst<mode>_t_zero): Remove insns.

gcc/testsuite/ChangeLog:
	PR target/53988
	* gcc.target/sh/pr53988.c: Mark tests as xfail.
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