Improved perf for T12227
Improved perf for T12227

Improved compiler allocations by abut 5%.  It comes from one of

1a4c04b1 Fix 'SPECIALISE instance'
c48595ee Never apply worker/wrapper to DFuns
05d233e8 Move InId/OutId to CoreSyn
e07ad4db Don't eta-expand in stable unfoldings
d250d493 Add INLINE pragamas on Traversable default methods
c66dd05c Move typeSize/coercionSize into TyCoRep

I think d250d493.

But it's good anyway.

shlevy/ghc,shlevy/ghc,ezyang/ghc,olsner/ghc,sdiehl/ghc,sdiehl/ghc,ezyang/ghc,olsner/ghc,sdiehl/ghc,ezyang/ghc,sdiehl/ghc,olsner/ghc,shlevy/ghc,ezyang/ghc,ezyang/ghc,olsner/ghc,ezyang/ghc,shlevy/ghc,shlevy/ghc,olsner/ghc,sdiehl/ghc,olsner/ghc,ezyang/ghc,shlevy/ghc,sdiehl/ghc,shlevy/ghc,sdiehl/ghc,olsner/ghc