[clang] [analyzer] Fix FP for cplusplus.placement new #149240 (PR #150161)

[Balazs Benics via cfe-commits]

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+// RUN: %clang -fsyntax-only -Xclang -analyze -Xclang -analyzer-checker=cplusplus.PlacementNew -Xclang -verify -std=c++17 %s
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steakhal wrote:

```suggestion
// RUN: %clang_analyze_cc1 -analyzer-checker=core,cplusplus.PlacementNew -verify -std=c++17 %s

```

https://github.com/llvm/llvm-project/pull/150161