Change the type descriptor hash and equal functions from C code pointers
to Go func values. This permits them to be set to a Go function
closure. This is in preparation for the Go 1.5, so that we can use a
closure for the hash/equal functions returned by the new reflect.ArrayOf
function.
Reviewed-on: https://go-review.googlesource.com/16485
From-SVN: r229541
This includes the use of __complex and __builtin_ functions where
unprefixed entities would suffice, and the use of a union for
bit-casting between types.
From-SVN: r211036
