* inf-ptrace.c (inf_ptrace_target): Do not set to_xfer_memory.
(inf_ptrace_xfer_memory): Delete.
* target.c (target_xfer_partial_p, xfer_using_stratum): New.
(target_read_memory, target_write_memory): Use xfer_using_stratum
when target_xfer_partial_p.
(debug_target): Move to start of file.
(target_read_memory_partial, target_write_memory_partial): Use
to_xfer_partial when target_xfer_partial_p.
* inf-ptrace.c (inf_ptrace_xfer_partial): Replace call to
inf_ptrace_xfer_memory with equivalent code.
* inftarg.c (child_xfer_partial): When performing a write, pass
writebuf to child_xfer_memory.
* inf-child.c: Include "gdb_string.h".
(inf_child_core_file_to_sym_file): Delete.
(inf_child_target): Set to_fetch_registers and to_store_registers.
* inf-ptrace.c: Include "gdb_string.h".
* Makefile.in: Update all dependencies.