[clang] [compiler-rt] [llvm] [tsan] Revive TSAN's standalone deadlock sanitizer implementation (PR #212748)

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``````````diff
--- lit.cfg.py	2026-07-29 11:20:20.000000 +0000
+++ lit.cfg.py	2026-07-29 11:42:17.800916 +0000
@@ -17,19 +17,24 @@
 
 if default_tsan_deadlock_opts:
     config.environment["TSAN_DEADLOCK_OPTIONS"] = default_tsan_deadlock_opts
     default_tsan_deadlock_opts += ":"
 config.substitutions.append(
-    ("%env_tsan_deadlock_opts=", "env TSAN_DEADLOCK_OPTIONS=" + default_tsan_deadlock_opts)
+    (
+        "%env_tsan_deadlock_opts=",
+        "env TSAN_DEADLOCK_OPTIONS=" + default_tsan_deadlock_opts,
+    )
 )
 
 clang_tsan_deadlock_cflags = (
     ["-fsanitize=thread-deadlock", "-Wall", "-pthread"]
     + [config.target_cflags]
     + config.debug_info_flags
 )
-clang_tsan_deadlock_cxxflags = config.cxx_mode_flags + clang_tsan_deadlock_cflags + ["-std=c++14"]
+clang_tsan_deadlock_cxxflags = (
+    config.cxx_mode_flags + clang_tsan_deadlock_cflags + ["-std=c++14"]
+)
 
 
 def build_invocation(compile_flags):
     return " " + " ".join([config.clang] + compile_flags) + " "
 

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https://github.com/llvm/llvm-project/pull/212748