Replace the use of -sil-inline-threshold with @inline(never) on specific
functions. This is required in some cases in order to remove the generic
specialization pass and allow the inliner to do the specialization
instead (specifically the cases where the parameter is 0, which causes
us to exit the inliner immediately).
Also add public in some places to ensure that we do not toss out
functions before we even make it to the inliner (once the standalone
generic specialization pass is removed).
Swift SVN r31126
In most cases this means adding @public to things that get serialized;
in a few cases it means using a modern public stdlib API instead of
a legacy thing I was trying to keep @internal.
Swift SVN r19350
