[patch] Cleanup handling of UniqueExternalLinkage.

[Rafael Espíndola]

Hi Douglas,

Before trying to implement the C++11 rules for anonymous namespaces
(or fix pr15930) I would like to cleanup how we handle
UniqueExternalLinkage.

The attached patch is a nop. It just replaces most uses of getLinkage
with getSemaLinkage and getCodeGenLinkage. Some of these calls should
be audited to make sure they are calling the right function, but that
is probably better done in an independent patch, so this one is
mechanical:

hasExternalLinkage -> hasExternalCodeGenLinkage

isExternalLinkage(foo->getLinkage()) -> hasExternalSemaLinkage

getLinkage() == ExternalLinkage -> hasExternalCodeGenLinkage

getLinkage() == InternalLinkage  -> getSemaLinkage() == InternalLinkage

Cheers,
Rafael
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