[llvm] [Dexter] Update Dexter lit substitutions, making lldb-dap the default (PR #155838)

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``````````diff
--- lit.cfg.py	2025-08-28 14:05:50.000000 +0000
+++ lit.cfg.py	2025-08-28 14:11:22.829348 +0000
@@ -124,13 +124,22 @@
     dexter_path = os.path.join(
         config.cross_project_tests_src_root, "debuginfo-tests", "dexter", "dexter.py"
     )
     tools.append(ToolSubst("%dexter", f'"{sys.executable}" "{dexter_path}" test'))
     if lldb_dap_path is not None:
-        tools.append(ToolSubst("%dexter_lldb_args", f'--lldb-executable "{lldb_dap_path}" --debugger lldb-dap'))
+        tools.append(
+            ToolSubst(
+                "%dexter_lldb_args",
+                f'--lldb-executable "{lldb_dap_path}" --debugger lldb-dap',
+            )
+        )
     elif lldb_path is not None:
-        tools.append(ToolSubst("%dexter_lldb_args", f'--lldb-executable "{lldb_path}" --debugger lldb'))
+        tools.append(
+            ToolSubst(
+                "%dexter_lldb_args", f'--lldb-executable "{lldb_path}" --debugger lldb'
+            )
+        )
 
     # For testing other bits of dexter that aren't under the "test" subcommand,
     # have a %dexter_base substitution.
     dexter_base_cmd = '"{}" "{}"'.format(sys.executable, dexter_path)
     tools.append(ToolSubst("%dexter_base", dexter_base_cmd))
@@ -152,19 +161,24 @@
         dependencies = ["clang", "lldb"]
         dexter_regression_test_c_builder = "clang"
         dexter_regression_test_cxx_builder = "clang++"
         if lldb_dap_path is not None:
             dexter_regression_test_debugger = "lldb-dap"
-            dexter_regression_test_additional_flags = f'--lldb-executable "{lldb_dap_path}"'
+            dexter_regression_test_additional_flags = (
+                f'--lldb-executable "{lldb_dap_path}"'
+            )
         else:
             dexter_regression_test_debugger = "lldb"
             dexter_regression_test_additional_flags = f'--lldb-executable "{lldb_path}"'
         dexter_regression_test_c_flags = "-O0 -glldb -std=gnu11"
         dexter_regression_test_cxx_flags = "-O0 -glldb -std=gnu++11"
 
     tools.append(
-        ToolSubst("%dexter_regression_test_debugger_args", f"--debugger {dexter_regression_test_debugger} {dexter_regression_test_additional_flags}")
+        ToolSubst(
+            "%dexter_regression_test_debugger_args",
+            f"--debugger {dexter_regression_test_debugger} {dexter_regression_test_additional_flags}",
+        )
     )
 
     # Typical command would take the form:
     # ./path_to_py/python.exe ./path_to_dex/dexter.py test --fail-lt 1.0 -w --binary %t --debugger lldb --cflags '-O0 -g'
     dexter_regression_test_run = " ".join(

``````````

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https://github.com/llvm/llvm-project/pull/155838