This makes `hashInteger` behave the same way as `integer-gmp`s
`hashInteger`.

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

I forgot to push this as part of #8444.

Signed-off-by: Austin Seipp <austin@well-typed.com>

Link to documentation of library in the wiki

For a deatiled discussion of this changes please visit the wiki page:
http://hackage.haskell.org/trac/ghc/wiki/PrimBool

If we use "smallInteger 0#" in the definitions, then that turns into
an Integer literal, but the compiler can't handle Integer literals
while compiling the integer package (as it can't look up the
mkInteger Id yet).

We now keep the HEAD version numbers as values which would be suitable
for immediate release.

Now used by GHC to generate Integer literals.

We can now use [] as it has been moved to ghc-prim.

Now used by GHC to generate Integer literals.

Stops code size explosions, and allows the built-in rules to fire

Fixes the build when compiling with -O0

From daniel.is.fischer.