merge from gcc

include/objalloc.h

include/obstack.h

include/partition.h

include/splay-tree.h

libiberty/ChangeLog

libiberty/mempcpy.c

libiberty/memset.c

libiberty/mkstemps.c

libiberty/objalloc.c

libiberty/obstack.c

libiberty/partition.c

libiberty/pex-djgpp.c

libiberty/pex-msdos.c

libiberty/pex-unix.c

libiberty/pex-win32.c

libiberty/physmem.c

libiberty/putenv.c

libiberty/random.c

libiberty/rename.c

libiberty/rindex.c