or1k-intmulticycle: add new test
gcc regression makefile: updates

We now compile with -O2 and -lm. Some tests needed -lm, and others
appear to not like it. However we now have a list of tests we're skipping
(there's only a few) to ensure it goes through without stopping
intmulticycle test: bug fix
add or1k-intmulticycle tests to regression list
inttickloop test: add test which tests simultaneous IRQ and tick exceptions
intloop test: make longer
inttickloop test: disable timer before finishing
Merge pull request #3 from skristiansson/master

Many good fixes from stekern
Merge branch 'master' of https://github.com/juliusbaxter/mor1kx-dev-env
inttickloop test: add to all mor1kx simulation lists
sysc: avoid using orpsoc internal classes directly

The problem with using the internal classes directly is
that you have to use the internally generated name,
this in itself is perhaps not such a big issue, the issue
is that the internal name changes when the underlaying verilog
design changes.
This works around this by using the classes through the
top module, which is part of the external api.