tests: Add the 'constants.all_compiled_tag'

This can be used to write tests which use the 'build/ALL/gem5.opt'
binary.

Change-Id: I7a94ac74b2e59493fa04f96e7f4c26bbf9772fbb
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/57509
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed