Reuse the same tag on retries.

	Avoid confusing them with already completed transfers.

	Due to XEN bug it prevents Linux boot. Remove it at least, until
	workaround is found.

	involved or only thumb2 is used.

	Some compilers don't support it.

	Not very useful and interaction of it with regexp depends on GCC
	version.

	* grub-core/loader/i386/xen_fileXX.c: Likewise.

	rather than LL suffix.

	messages has proper arguments.

	64-bit quantity.

To reproduce the problem, make sure you have a GPG public key available, build and install GRUB:
grub-install --debug --debug-image="all" --pubkey=/boot/pubkey.gpg --modules="serial terminfo gzio search search_label search_fs_uuid search_fs_file linux vbe video_fb video mmap relocator verify gcry_rsa gcry_dsa gcry_sha256 hashsum gcry_sha1 mpi echo loadenv boottime" /dev/sda
Sign all the files in /boot/grub/* and reboot.

'make check' results identical before and after this change.

TESTED: In a QEMU VM using an i386 target.