[clang] [clang-repl] Lay the basic infrastructure for pretty printing of types (PR #148701)

[Vassil Vassilev via cfe-commits]

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@@ -300,16 +640,17 @@ llvm::Expected<Expr *> Interpreter::ExtractValueFromExpr(Expr *E) {
 using namespace clang;
 
 // Temporary rvalue struct that need special care.
-REPL_EXTERNAL_VISIBILITY void *
+REPL_EXTERNAL_VISIBILITY extern "C" void *
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vgvassilev wrote:

@AaronBallman I will need some help here. I think the windows issue we are seeing stems from here. If I move the `REPL_EXTERNAL_VISIBILITY` after `extern "C"` msvc errors out. If I keep it there I do not think it has an effect to export the symbol...

https://github.com/llvm/llvm-project/pull/148701