* grub-core/kern/mips/arc/init.c (grub_machine_get_bootlocation):
Initialise pend to pacify GCC.
* configure.ac: Remove several unnecessary semicolons.
Support grub-emu on x32 (ILP32 but with x86-64 instruction set)

* configure.ac: Remove -m64 from checks for -mcmodel=large and
-mno-red-zone.  These are always either unnecessary (x86_64-emu) or
already in TARGET_CFLAGS at this point, and they produce incorrect
results when building for x32.
* grub-core/kern/x86_64/dl.c (grub_arch_dl_relocate_symbols): Cast
pointers to Elf64_Xword via grub_addr_t, in order to work on x32.
* include/grub/x86_64/types.h (GRUB_TARGET_SIZEOF_VOID_P,
GRUB_TARGET_SIZEOF_LONG): Define to 4 on x32.
Fix incorrect address reference in btrfs

We encountered a weird random kernel initrd unpacking error on btrfs
and finally found it was caused by incorrect address reference in range
check for type GRUB_BTRFS_EXTENT_REGULAR and the entire result is
unpredictable.

This is a quick fix to make the address reference to the
grub_btrfs_extent_data structure correctly, not the pointer variable
to it.

Any suggestions to this patch is welcome.
Merge branch 'master' of git://git.sv.gnu.org/grub into HEAD