Spectral norm allocations increased 17% between 7.6 and 7.8

It appears that spectral-norm regressed rather severely from 7.6 to 7.8 in total allocations. Meanwhile the binary size also increased by 7% or so. However, it also appears that runtime was unaffected by this change.

The rule firings are very similar between 7.6 and 7.8. Three rules fire in 7.8 that do not fire in 7.6,

  1 Class op formatArg 
  1 Class op parseFormat              
  1 tagToEnum#     

The difference in allocation persists even if one reverts the Text.Printf rewrite that gives rise to the formatArg and parseFormat rules, so these can be safely ignored.