[PATCH] [Sema] Delay attribute checking until auto types are deduced

[Nico Rieck]

This patch delays the call to Sema::checkAttributesAfterMerging to delay
linkage computation. This has already been done once in the past, but
when auto is involved this is not enough and something like the
following crashes:

namespace { class Internal {}; }
__attribute__((weak)) auto f = Internal();


-Nico
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