* mi/mi-main.c (mi_cmd_data_write_memory): Handle additional
parameter COUNT, for pattern filling of memory regions.
* NEWS: Mention it.
doc
* gdb.texinfo (GDB/MI Data Manipulation): Document new optional
parameter "count" of -data-write-memory-bytes, and add an example.
testsuite
* gdb.mi/mi-fill-memory.exp: New test.