[clang] [analyzer] Add optin.taint.TaintedDiv checker (PR #106389)

[Donát Nagy via cfe-commits]

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@@ -1288,6 +1288,34 @@ by explicitly marking the ``size`` parameter as sanitized. See the
     delete[] ptr;
   }
 
+.. _optin-taint-TaintedDiv:
+
+optin.taint.TaintedDiv (C, C++, ObjC)
+"""""""""""""""""""""""""""""""""""""
+This checker warns when the denominator in a division
+operation is a tainted (potentially attacker controlled) value.
+If the attacker can set the denominator to 0, a runtime error can
+be triggered. The checker warns if the analyzer cannot prove
+that the denominator is not 0 and it is a tainted value.
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NagyDonat wrote:

```suggestion
be triggered. The checker warns when the denominator is a tainted value and the
analyzer cannot prove that it is not 0.
```
Swap these two conditions to clarify that  "is a tainted value" is not within the "the analyzer cannot prove that" block.

https://github.com/llvm/llvm-project/pull/106389