enable -dcmm-lint by default for .cmm input files
I'm finding it's quite easy to write
.cmm files with subtle errors that cause ghc to emit code that wasn't what I wanted! For example, I wrote a comparison between two arguments of different integer sizes and the code generator picked the wrong size. After tracking down the bug, I tried
-dcmm-lint and it caught my error right away.
It makes sense not to have
-dcmm-lint enabled by default for Cmm produced from Stg, but I've seen here on the GHC wiki that
-dcmm-lint is advised for hand-written
.cmm files. But
integer-gmp, and probably many other packages, don't build
.cmm files with
-dcmm-lint. Is there a reason we can't/shouldn't just make it the default?