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

[Aaron Ballman 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 *
----------------
AaronBallman wrote:

That didn't seem to work, but then why does this work already?

https://github.com/llvm/llvm-project/blob/b7c14b6ded300b9190fe0b65881d04c54b2a9fbd/clang/lib/Interpreter/InterpreterValuePrinter.cpp#L311

But this one uses a different style: 
https://github.com/llvm/llvm-project/blob/b7c14b6ded300b9190fe0b65881d04c54b2a9fbd/clang/lib/Interpreter/InterpreterValuePrinter.cpp#L303

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