dllimport on explicit instantiation of dllexport function template is ignored

[zmodem]

Bugzilla Link	20136
Version	trunk
OS	Windows NT

Extended Description

In this example:

template void __declspec(dllexport) f() { };
template void __declspec(dllimport) f();
void foo() { f(); }

We ignore dllimport on the f instantiation, and end up exporting it, which is the opposite of what MSVC does.