pr50749-sf-postinc-1.c: Skip for -m3.

pr50749-sf-postinc-1.c: Skip for -m3.

	* gcc.target/sh/pr50749-sf-postinc-1.c: Skip for -m3.  Don't skip for
	-m2e or -m2a.
	* gcc.target/sh/pr50749-sf-postinc-3.c: Likewise.
	* gcc.target/sh/pr53511-1.c: Likewise.
	* gcc.target/sh/pr50749-sf-predec-1.c: Likewise.
	* gcc.target/sh/pr50749-sf-predec-3.c: Likewise.
	* gcc.target/sh/pr53512-1.c: Skip for -m3*.
	* gcc.target/sh/pr53512-3.c: Likewise.
	* gcc.target/sh/pr21255-3.c: Skip for single precision FPU targets.

From-SVN: r190327