x32: Encode %esp as %rsp to avoid 0x67 prefix

x32: Encode %esp as %rsp to avoid 0x67 prefix

Since the upper 32 bits of stack register are always zero for x32, we
can encode %esp as %rsp to avoid 0x67 prefix in address if there is no
index or base register.

gcc/

	PR target/82267
	* config/i386/i386.c (ix86_print_operand_address_as): Encode
	%esp as %rsp to avoid 0x67 prefix if there is no index or base
	register.

gcc/testsuite/

	PR target/82267
	* gcc.target/i386/pr82267.c: New test.

From-SVN: r253127