[cfe-dev] Wrong extern inside no braces linkage specification declaration

[Abramo Bagnara]

Currently clang marks these two declarations

extern "C" int a;
extern "C" void foo();

as extern in StorageClassAsWritten, but the inner declarations does not
have any storage class specified (and C++ standard does not allow any).

The attached patch wrt r102259 fixes the problem (and do not introduce
any regressions).
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