[clang] [clang-repl] Link builtin bitcode into every PTU (PR #229788)

[Aaron Jomy via cfe-commits]

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@@ -173,6 +174,16 @@ void BackendConsumer::HandleInterestingDecl(DeclGroupRef D) {
 
 // Links each entry in LinkModules into our module. Returns true on error.
 bool BackendConsumer::LinkInModules(llvm::Module *M) {
+  // Builtin bitcode is internalized into the module that links it, so each
+  // PTU of an incremental session needs its own copy. Plain bitcode files are
+  // still linked once.
+  if (LinkModules.empty() && LangOpts.IncrementalExtensions) {
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aaronj0 wrote:

makes sense, thanks

https://github.com/llvm/llvm-project/pull/229788