Perf improvement

[Simon Peyton Jones]

I'm seeing this in validate

bytes allocated value is too low:

(If this is because you have improved GHC, please

update the test so that GHC doesn't regress again)

    Expected    T5837(normal) bytes allocated: 56782344 +/-7%

    Lower bound T5837(normal) bytes allocated: 52807579

    Upper bound T5837(normal) bytes allocated: 60757109

    Actual      T5837(normal) bytes allocated: 52424864

    Deviation   T5837(normal) bytes allocated:     -7.7 %

*** unexpected stat test failure for T5837(normal)
Does anyone else?
Simon
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