[clang] [llvm] Introduce Intra-procedural lifetime analysis in Clang (PR #142313)

[via llvm-commits]

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<details>
<summary>
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``````````bash
darker --check --diff -r HEAD~1...HEAD clang/test/Sema/lifetime-safety-testcase-gen.py
``````````

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<summary>
View the diff from darker here.
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``````````diff
--- lifetime-safety-testcase-gen.py	2025-06-02 13:01:57.000000 +0000
+++ lifetime-safety-testcase-gen.py	2025-06-02 13:09:12.981509 +0000
@@ -1,7 +1,8 @@
 import sys
 import argparse
+
 
 def generate_cpp_test_data(n: int) -> str:
     """
     Generates a C++ code snippet with a specified number of pointers in a cycle.
 
@@ -43,32 +44,36 @@
 
     cpp_code += "}\n"
 
     return cpp_code
 
+
 if __name__ == "__main__":
     # Set up the argument parser
     parser = argparse.ArgumentParser(
         description="Generate C++ test data with a variable number of pointers in a cycle."
     )
-    
+
     # Add the '-n' argument
     parser.add_argument(
-        "-n", "--number",
+        "-n",
+        "--number",
         type=int,
         required=True,
-        help="The number of pointers to generate in the cycle."
+        help="The number of pointers to generate in the cycle.",
     )
 
     # Parse the arguments from the command line
     args = parser.parse_args()
-    
+
     number_of_pointers = args.number
 
     # Validate the input
     if number_of_pointers <= 0:
-         print("Error: The number of pointers must be a positive integer.", file=sys.stderr)
-         sys.exit(1)
+        print(
+            "Error: The number of pointers must be a positive integer.", file=sys.stderr
+        )
+        sys.exit(1)
 
     # Generate and print the code
     generated_code = generate_cpp_test_data(number_of_pointers)
     print(generated_code)

``````````

</details>


https://github.com/llvm/llvm-project/pull/142313