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

[Baranov Victor via cfe-commits]

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@@ -0,0 +1,13 @@
+#ifndef LLVM_CLANG_ANALYSIS_ANALYSES_LIFETIME_SAFETY_H
----------------
vbvictor wrote:

```suggestion
#ifndef LLVM_CLANG_ANALYSIS_ANALYSES_LIFETIMESAFETY_H
```
Underscore should be path separators, https://llvm.org/docs/CodingStandards.html#header-guard.

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