[clang-tidy] cppcoreguidelines-pro-bounds-pointer-arithmetic generates incorrect warnings re. to std::map::operator[]

[adesitter]

❯ clang-tidy --version
LLVM (http://llvm.org/):
  LLVM version 19.1.4
  Optimized build.

❯ cat m.cpp 
#include <map>
template <typename R>
int f(std::map<R*, int>& map, R* r) {
  return map[r];
}

❯ clang-tidy "--checks=-*,cppcoreguidelines-pro-bounds-pointer-arithmetic" -quiet m.cpp --
67 warnings generated.
/workspaces/ix/ct_bug_1/m.cpp:4:14: warning: do not use pointer arithmetic [cppcoreguidelines-pro-bounds-pointer-arithmetic]
    4 |   return map[r];
      |              ^

std::map::operator[] does not involve pointer arithmetic in user code.

[llvmbot]

@llvm/issue-subscribers-clang-tidy

Author: Arnaud Desitter (adesitter)

``` ❯ clang-tidy --version LLVM (http://llvm.org/): LLVM version 19.1.4 Optimized build.

❯ cat m.cpp
#include <map>
template <typename R>
int f(std::map<R*, int>& map, R* r) {
return map[r];
}

❯ clang-tidy "--checks=-*,cppcoreguidelines-pro-bounds-pointer-arithmetic" -quiet m.cpp --
67 warnings generated.
/workspaces/ix/ct_bug_1/m.cpp:4:14: warning: do not use pointer arithmetic [cppcoreguidelines-pro-bounds-pointer-arithmetic]
4 | return map[r];
| ^

`std::map::operator[]` does  not involve pointer arithmetic in user code.
</details>