[clang] [analyzer] Improve handling of placement new in `PointerArith` (PR #155855)

[Alejandro Álvarez Ayllón via cfe-commits]

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@@ -74,6 +74,26 @@ class PointerArithChecker
 
 REGISTER_MAP_WITH_PROGRAMSTATE(RegionState, const MemRegion *, AllocKind)
 
+namespace {
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alejandro-alvarez-sonarsource wrote:

Replaced with `static`

https://github.com/llvm/llvm-project/pull/155855