base: Remove dubious/unused Flags functions

base: Remove dubious/unused Flags functions

The functions isSet(), noneSet(), and allSet() assume that
all bits of the underlying container have a corresponding
flag. This is typically not true, and the likelihood of
incorrectly using these functions is high.

Fortunately these functions are not being used anywhere,
and can be safely removed.

Alternatively, a mask could be provided on construction to
determine which bits of the underlying container correspond
to a flag bit, so that the proper bits are checked in these
functions.

Change-Id: Ia7cbfd0726943506a3f04dc417e67a0b57cdbf95
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/38736
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>