Fix some warnings

This patch fixes some of the -Wall warnings. I haven't touched the ones generated by test/Test.hs cause there's too many.

I've renamed some variables to avoid shadowing. Let me know if you'd prefer something else.

added 19 commits

• 3582b82e...d2566bc3 - 18 commits from branch ghc:master
• f6cfa84b - Fix some warnings

Compare with previous version

I think most of these have been fixed now

closed