[clang] [clang-repl] Stop interpreter init on action failure (PR #217147)

[Vassil Vassilev via cfe-commits]

================
@@ -206,6 +206,16 @@ CreateCI(const llvm::opt::ArgStringList &Argv) {
   return std::move(Clang);
 }
 
+static llvm::Error
+ExecuteIncrementalAction(const std::unique_ptr<CompilerInstance> &CI,
+                         const std::unique_ptr<IncrementalAction> &Act) {
----------------
vgvassilev wrote:

```suggestion
ExecuteIncrementalAction(const CompilerInstance &CI,
                         const IncrementalAction &Act) {
```

https://github.com/llvm/llvm-project/pull/217147