re PR target/63783 ([SH] Miscompilation of boolean negation on SH4 using -O2)

re PR target/63783 ([SH] Miscompilation of boolean negation on SH4 using -O2)

gcc/
	PR target/63783
	PR target/51244
	* config/sh/sh_treg_combine.cc (sh_treg_combine::make_not_reg_insn):
	Do not emit bitwise not insn.  Emit logical not insn sequence instead.
	Adjust related comments throughout the file.

gcc/testsuite/
	PR target/63783
	PR target/51244
	* gcc.target/sh/torture/pr63783-1.c: New.
	* gcc.target/sh/torture/pr63783-2.c: New.
	* gcc.target/sh/pr51244-20.c: Adjust.
	* gcc.target/sh/pr51244-20-sh2a.c: Adjust.

From-SVN: r217969