[clang] [clang-repl] Teach clang-repl how to load PCHs (reprise) (PR #157359)

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``````````diff
--- lit.cfg.py	2025-09-07 18:52:27.000000 +0000
+++ lit.cfg.py	2025-09-07 19:04:20.509474 +0000
@@ -190,13 +190,11 @@
     config.available_features.add('host-supports-jit')
 
     if have_host_clang_repl_cuda():
         config.available_features.add('host-supports-cuda')
     hosttriple = run_clang_repl("--host-jit-triple")
-    config.substitutions.append(
-        ("%host-jit-triple",  hosttriple.strip())
-    )
+    config.substitutions.append(("%host-jit-triple", hosttriple.strip()))
 
     if have_host_out_of_process_jit_feature_support():
         config.available_features.add("host-supports-out-of-process-jit")
 
 if config.clang_staticanalyzer:

``````````

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https://github.com/llvm/llvm-project/pull/157359