Option to disable VSUSP at prompt (feature request with proof of concept)

[Eric Pruitt]

In my Bash configuration, I have things setup so Ctrl+Z is no longer
translated into a signal at the Bash prompt so it can be remapped. Most
recently, I decided to modify the Bash source to implement this change
in the interpreter because the stty invocations introduced a perceptible
amount of lag on a virtualized OpenBSD host I use. I think this feature
would be a useful default since it usually does not make sense to send
SIGTSTP to a prompt. Here's an accompanying snippet from my inputrc:

    # Allows Ctrl+Z to be used to bring programs back into the
    # foreground. The cursor is moved to the beginning of the line
    # before typing so a specific job can be resumed by typing its
    # identifier (e.g. a number) then hitting Ctrl+Z. This depends on
    # Ctrl+Z being a literal sequence i.e. "stty susp undef".
    "\C-z": "\C-afg \C-m"

With my changes to Bash and this in my inputrc, Ctrl+Z becomes a toggle.
I have attached the patch I wrote for myself. Since I only use modern
POSIX / UNIX-like systems, it was not written with portability in mind
and cannot be disabled with with "set" or "shopt." Consider it a proof
of concept rather than a pull request. Please let me know what you
think.

Thanks,
Eric

bash-4.4-automatic-susp-toggle.patch
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