coredump: extend core dump note section to contain file names of mapped files

coredump: extend core dump note section to contain file names of mapped files

This note has the following format:

long count     -- how many files are mapped
long page_size -- units for file_ofs
array of [COUNT] elements of
   long start
   long end
   long file_ofs
followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL...

Signed-off-by: Denys Vlasenko <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Amerigo Wang <[email protected]>
Cc: "Jonathan M. Foote" <[email protected]>
Cc: Roland McGrath <[email protected]>
Cc: Pedro Alves <[email protected]>
Cc: Fengguang Wu <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>