[clang-repl] Teach clang-repl how to load PCHs (reprise) (#157359) This is an updated version of @vgvassilev's PR from last year here: https://github.com/llvm/llvm-project/pull/94166 In short, it includes: 1. The fix for a blocking issue where `clang::Interpreter` (and thus `clang-repl`) cannot resolve symbols defined in a PCH 2. A test to prove this is working 3. A new hidden flag for `clang-repl` so that `llvm-lit` can match the host JIT triple between the PCH and `clang-repl`; previously, they may differ in some cases 4. Everything based on the latest LLVM main Shout out to @kylc for finding a logic issue which had us stumped for a while (and securing the [bounty](https://github.com/jank-lang/jank/issues/446)). --------- Co-authored-by: Vassil Vassilev <v.g.vassilev@gmail.com> Co-authored-by: Kyle Cesare <kcesare@gmail.com>
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