[clang] [LifetimeSafety] Introduce intra-procedural analysis in Clang (PR #142313)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-with-lto-ubuntu` running on `as-worker-91` while building `clang` at step 7 "test-stage1-compiler".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/49/builds/1866

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 7 (test-stage1-compiler) failure: build (failure)
...
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using ld64.lld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/ld64.lld
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using wasm-ld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/wasm-ld
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/utils/lit/tests/lit.cfg:111: warning: Setting a timeout per test not supported. Requires the Python psutil module but it could not be found. Try installing it via pip or via your operating system's package manager.
 Some tests will be skipped and the --timeout command line argument will not work.
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using ld.lld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/ld.lld
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using lld-link: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/lld-link
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using ld64.lld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/ld64.lld
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using wasm-ld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/wasm-ld
-- Testing: 85605 tests, 72 workers --
Testing:  0.. 10.. 
FAIL: Clang :: Sema/warn-lifetime-safety-dataflow.cpp (18361 of 85605)
******************** TEST 'Clang :: Sema/warn-lifetime-safety-dataflow.cpp' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
/home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/clang -cc1 -internal-isystem /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/lib/clang/21/include -nostdsysteminc -mllvm -debug-only=LifetimeFacts -Wexperimental-lifetime-safety /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/clang/test/Sema/warn-lifetime-safety-dataflow.cpp 2>&1 | /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/FileCheck /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/clang/test/Sema/warn-lifetime-safety-dataflow.cpp # RUN: at line 1
+ /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/clang -cc1 -internal-isystem /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/lib/clang/21/include -nostdsysteminc -mllvm -debug-only=LifetimeFacts -Wexperimental-lifetime-safety /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/clang/test/Sema/warn-lifetime-safety-dataflow.cpp
+ /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/FileCheck /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/clang/test/Sema/warn-lifetime-safety-dataflow.cpp
/home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/clang/test/Sema/warn-lifetime-safety-dataflow.cpp:9:17: error: CHECK-LABEL: expected string not found in input
// CHECK-LABEL: Function: return_local_addr
                ^
<stdin>:1:1: note: scanning from here
clang (LLVM option parsing): Unknown command line argument '-debug-only=LifetimeFacts'. Try: 'clang (LLVM option parsing) --help'
^
<stdin>:1:105: note: possible intended match here
clang (LLVM option parsing): Unknown command line argument '-debug-only=LifetimeFacts'. Try: 'clang (LLVM option parsing) --help'
                                                                                                        ^

Input file: <stdin>
Check file: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/clang/test/Sema/warn-lifetime-safety-dataflow.cpp

-dump-input=help explains the following input dump.

Input was:
<<<<<<
           1: clang (LLVM option parsing): Unknown command line argument '-debug-only=LifetimeFacts'. Try: 'clang (LLVM option parsing) --help' 
label:9'0     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
label:9'1                                                                                                             ?                          possible intended match
           2: clang (LLVM option parsing): Did you mean '--debug-pass=LifetimeFacts'? 
label:9'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>>>>

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 

1 warning(s) in tests

```

</details>

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