[clang] [clang][StaticAnalyzer] Adding getentropy to CStringChecker. (PR #83675)

[Balazs Benics via cfe-commits]

================
@@ -2515,6 +2518,57 @@ void CStringChecker::evalSprintfCommon(CheckerContext &C, const CallEvent &Call,
   C.addTransition(State);
 }
 
+void CStringChecker::evalGetentropy(CheckerContext &C,
+                                    const CallEvent &Call, CharKind CK) const {
+  DestinationArgExpr Buffer = {{Call.getArgExpr(0), 0}};
+  SizeArgExpr Size = {{Call.getArgExpr(1), 1}};
+  ProgramStateRef State = C.getState();
+  const LocationContext *LCtx = C.getLocationContext();
+  SValBuilder &Builder = C.getSValBuilder();
----------------
steakhal wrote:

```suggestion
  SValBuilder &SVB = C.getSValBuilder();
```
We usually call this `SVB`.

https://github.com/llvm/llvm-project/pull/83675