[RFC 0/5] info [args|functions|locals|variables] [-q] [-t TYPEREGEXP] [NAMEREGEXP]

[Philippe Waroquiers <philippe.waroquiers@skynet.be>]

[RFC 0/5] info [args|functions|locals|variables] [-q] [-t TYPEREGEXP] [NAMEREGEXP]

This patch series adds flags and/or arguments
[-q] [-t TYPEREGEXP] [NAMEREGEXP] to the commands
  info [args|functions|locals|variables]

The additional arguments allow to more precisely specify what to print.
This patch series does not depend on
[RFA_v3 0/8] Implement 'frame apply COMMAND', enhance 'thread apply COMMAND'.
However, the new features above can usefully be combined with
frame apply and thread apply.
So, the documentation gives examples combining the above
and the 'thread apply' and 'frame apply' commands.

Some examples:
* print functions returning an int:
    info functions -t '^int ('
* print local variables having pthread_t type
    info locals -t pthread_t
* print global variables having type 'struct addrinfo'
    info var -t 'struct addrinfo'
* print args that are likely file descriptors
    info arg -t int .*fd.*

Below examples depends on the 'thread/frame apply' patch series.

* Assuming lock_something_t is an RAII type, show all locks:
  thread apply all -s frame apply all -s info locals -q -t lock_something_t
 or shorter equivalent:
  tfaas i lo -q -t lock_something_t

* show frames and args having an arg with type matchin std::.*map
  so likely  std::map or std::unordered_map
  frame apply all -s info args -q std::.*map


The code, documentation and NEWS is (supposed to be) complete.
ChangeLog and tests are still to be done.