[PATCH] clang-cl: Only mark dllexported constexpr functions once

[Ehsan Akhgari]

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Comment at: lib/Sema/SemaDeclCXX.cpp:4745
@@ -4744,1 +4744,3 @@
       if (MD->isUserProvided()) {
+        // Don't mark constexpr functions again
+        if (MD->isConstexpr())
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hans wrote:
> The comment is a little vague (and should end with a period). Maybe something like "constexpr functions are already marked referenced."
> 
> Also, David pointed out that this does not only apply to user-defined functions, so it should be moved back to where you first suggested in the PR. Sorry for my misleading suggestion here before.
What about http://llvm.org/bugs/show_bug.cgi?id=21718#c6?

http://reviews.llvm.org/D6528