[clang] [compiler-rt] [llvm] Add numerical sanitizer (PR #85916)

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``````````bash
darker --check --diff -r 9fd1c4121f7c797ff7222161cb40cd68ecf0fbc8...f932900890ba96ae01f8c4d762aca5023d0b7fce compiler-rt/test/nsan/lit.cfg.py
``````````

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View the diff from darker here.
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``````````diff
--- lit.cfg.py	2024-03-20 09:59:30.000000 +0000
+++ lit.cfg.py	2024-03-20 10:39:52.135628 +0000
@@ -1,45 +1,53 @@
 # -*- Python -*-
 
 import os
 
 # Setup config name.
-config.name = 'NSan' + config.name_suffix
+config.name = "NSan" + config.name_suffix
 
 # Setup source root.
 config.test_source_root = os.path.dirname(__file__)
 
 # Test suffixes.
-config.suffixes = ['.c', '.cc', '.test']
+config.suffixes = [".c", ".cc", ".test"]
 
 # C & CXX flags.
-c_flags = ([config.target_cflags])
+c_flags = [config.target_cflags]
 
 # Android doesn't want -lrt.
 if not config.android:
-  c_flags += ["-lrt"]
+    c_flags += ["-lrt"]
 
-cxx_flags = (c_flags + config.cxx_mode_flags + ["-std=c++17"])
+cxx_flags = c_flags + config.cxx_mode_flags + ["-std=c++17"]
 
-nsan_flags = ["-fsanitize=numerical", "-g",
-              "-mno-omit-leaf-frame-pointer",
-              "-fno-omit-frame-pointer"]
+nsan_flags = [
+    "-fsanitize=numerical",
+    "-g",
+    "-mno-omit-leaf-frame-pointer",
+    "-fno-omit-frame-pointer",
+]
+
 
 def build_invocation(compile_flags):
-  return " " + " ".join([config.clang] + compile_flags) + " "
+    return " " + " ".join([config.clang] + compile_flags) + " "
+
 
 # Add substitutions.
 config.substitutions.append(("%clang ", build_invocation(c_flags)))
 config.substitutions.append(("%clang_nsan ", build_invocation(c_flags + nsan_flags)))
-config.substitutions.append(("%clangxx_nsan ", build_invocation(cxx_flags + nsan_flags)))
+config.substitutions.append(
+    ("%clangxx_nsan ", build_invocation(cxx_flags + nsan_flags))
+)
 
 # Platform-specific default NSAN for lit tests.
-default_nsan_options = ''
+default_nsan_options = ""
 
-config.environment['NSAN_OPTIONS'] = default_nsan_options
-default_nsan_options += ':'
-config.substitutions.append(('%env_nsan_options=',
-                             'env NSAN_OPTIONS=' + default_nsan_options))
+config.environment["NSAN_OPTIONS"] = default_nsan_options
+default_nsan_options += ":"
+config.substitutions.append(
+    ("%env_nsan_options=", "env NSAN_OPTIONS=" + default_nsan_options)
+)
 
 # NSan tests are currently supported on Linux only.
-if config.host_os not in ['Linux']:
-   config.unsupported = True
+if config.host_os not in ["Linux"]:
+    config.unsupported = True

``````````

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https://github.com/llvm/llvm-project/pull/85916