[clang-repl] Rework layering of incremental executors. (#175448) The original Interpreter implementation had a hard dependency on ORC and grew organically with the addition of out-of-process JIT support. This tightly coupled the Interpreter to a specific execution engine and leaked ORC-specific assumptions (runtime layout, symbol lookup, exception model) into higher layers. The WebAssembly integration demonstrated that incremental execution can be implemented without ORC, exposing the need for a cleaner abstraction boundary. This change introduces an IncrementalExecutor interface and moves ORC-based execution behind a concrete implementation. The Interpreter now depends only on the abstract executor, improving layering and encapsulation. In addition, the Interpreter can be configured with user-provided incremental executor implementations, enabling ORC-independent execution, easier testing, and future extensions without modifying the core Interpreter.
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