Better perf

[Simon Peyton Jones]

I've just committed this patch sequence

fb9ae288088a3eabc4e1bb4e86fa473a3881d2e2 Make FloatOut/SetLevels idemoptent on bottoming functions

995ab74b3c55fe3a0299bd94b49e948c942e76d6 Comments only

1163f4f2fe9aabd722c963497c67c5f8c71ef71b Tiny refactor

9b2c73ea8082199245bfa6a28390b70b38f87fd1 Make TH_Roles2 less fragile

9304df5230a7a29d3e992916d133e462b854e55f Fix CSE (again) on literal strings
In my final validate run (after updating to HEAD) I saw

Unexpected stat failures:

   perf/compiler/T13035.run    T13035 [stat too good] (normal)

-6.4% alloc



   perf/compiler/T12425.run    T12425 [stat too good] (optasm)

-6.6% alloc



   perf/compiler/T9675.run     T9675 [stat too good] (optasm)

-10.4% alloc



   perf/compiler/T1969.run     T1969 [stat too good] (normal)

-21% peak megabytes



   perf/space_leaks/T4029.run  T4029 [stat too good] (ghci)

-14% peak megabytes
This is good.  I did not see these in earlier validations (perhaps I did not rebuild the libraries sufficiently), so I have left them.  If Harbormaster agrees that perf has improved, could someone re-centre the numbers?  Ideally say which patch is responsible.
Simon
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