i386: Check red zone size in push peephole2

i386: Check red zone size in push peephole2

Check red zone size, instead of if red zone is available, in push
peephole2s.

gcc/

	PR target/82499
	* config/i386/i386.h (ix86_red_zone_size): New.
	* config/i386/i386.md (push peephole2s): Replace
	"!ix86_using_red_zone ()" with "ix86_red_zone_size == 0".

gcc/testsuite/

	PR target/82499
	* gcc.target/i386/pr82499-1.c: New file.
	* gcc.target/i386/pr82499-2.c: Likewise.
	* gcc.target/i386/pr82499-3.c: Likewise.

From-SVN: r253718