[patch] Don't internalize all but main by default

[Rafael Espíndola]

This is mostly a cleanup, but it changes a fairly old behavior.

Every "real" LTO user was already disabling the silly internalize pass
and creating the internalize pass itself. The difference with this
patch is for "opt -std-link-opts" and the C api.

Now to get a usable behavior out of opt one doesn't need the funny
looking command line:

opt  -internalize -disable-internalize
-internalize-public-api-list=foo,bar -std-link-opts

Cheers,
Rafael
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