0b922d66e5
This PR add diagnostics for 3-parameter `std::basic_string(const char*
t, size_type pos, size_type count)` constructor in
bugprone-string-constructor check:
```cpp
std::string r1("test", 1, 0); // constructor creating an empty string
std::string r2("test", 0, -4); // negative value used as length parameter
// more examples in test file
```
Fixes false-positives reported in https://github.com/llvm/llvm-project/issues/123198.
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