100 tests is entirely insufficient to achieve reasonable coverage.

Otherwise multiple parallel runs may race with one another.

This implements the start of #14, introducing a predicate to determine
whether an `Expr` has a well-defined value. We aren't currently using it
in the `Arbitrary` instance.

Previously the generator check to avoid signed overflows applied even if
we were generating an unsigned division.

Fixes #8.

Older cabal-install versions suffered from a bug where
cmm-sources were not included in linking
of executables. We previously hacked around this
by injecting the flag into the link via `ghc-options`. This has been fixed in `cabal-install-3.12.1.0` so we can drop the hack.

Also use -fPIC when compiling cmm, in edge cases the assembler trips up
otherwise.

By respecting/passing the return width instead of always widening
to platform width.

Shuffle implementation around to better isolate it and leave some zeros
at the beginning we have an easily-available identity for addition.

This is frequently needed.

Track process results purely, makely it easier to see where failure
should be handled. The one exception here is `Interpreter`, which still
handles divergence via exceptions.

This will hopefully provide some indication whether MO_MulMayOflo is
excessively conservative.

This adds support for running pipelines from upstream jobs in ghc/ghc

Fix non-emulated case in simple

See merge request !15