swift234

Make internal stdlib functions public, which are called from the stdlib tests.
And make sure that all those public identifiers are preceeded with underscores.

I marked these public-modifiers with "// @testable" to document why they are public.
If some day we have a @testable attribute it should be used instead of those public-modifiers.

Again, this is needed for enabling dead internal function elimination in the stdlib.



Swift SVN r22657