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This makes them perform well robustly
(e.g. in test perf/should_run/MethSharing)
rather than relying on a rather delicate
let-floating.  See Note [Inlining (^) in Real.lhs

This is part of the fix for #4436

  showMultiLineString :: String -> [String]
  -- | Like 'showLitString' (expand escape characters using Haskell
  -- escape conventions), but 
  --   * break the string into multiple lines
  --   * wrap the entire thing in double quotes
  -- Example:  @breakMultiLineString "hello\ngoodbye\nblah"@ 
  -- returns   @["\"hello\\", "\\goodbye\\", "\\blah\"" ]@
  -- where those "\\" are really just a single backslash
  -- (but I'm writing them here as Haskell literals)

fromRational :: Rational -> Ratio a produced invalid results for fixed-width
types a. Reduce the fraction to avoid that.

Special versions for the power functions with a Rational base and rewrite rules.

Avoid superfluous gcd calculation in recip for Ratio a because numerator
and denominator are known to be coprime.

Make selector thunks visible to GHC to fix a space leak in lines.

Rewrite rules for RealFrac methods with sized Int and Word targets.
For all types whose range is contained in Int's range, there are now
rewrite rules for properFraction, truncate, floor, ceiling and round
from Double and Float, going through the specialised methods for Int.

Unfortunately, we can't have a rewrite rule for Word.

  
Reason: avoid having to link the entire ghc package in modules
that use compile-time annotations:
  
       import GHC.Exts( SpecConstrAnnotation )
       {-# ANN type T ForceSpecConstr #-}
  
It's a kind of bug that the package exporting SpecConstrAnnotation
is linked even though it is only needed at compile time, but putting
the data type declaration in GHC.Exts is a simple way to sidestep
the problem
  
See See Note [SpecConstrAnnotation] in SpecConstr

Fix scaleFloat by clamping the scaling parameter so that
exponent + scale doesn't overflow.

Patch by: Daniel Fischer <daniel.is.fischer@web.de>