[clang] [analyzer] Untangle subcheckers of CStringChecker (PR #113312)

[via cfe-commits]

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@@ -768,9 +776,17 @@ ProgramStateRef CStringChecker::CheckOverlap(CheckerContext &C,
   std::tie(stateTrue, stateFalse) = state->assume(*OverlapTest);
 
   if (stateTrue && !stateFalse) {
-    // Overlap!
-    emitOverlapBug(C, stateTrue, First.Expression, Second.Expression);
-    return nullptr;
+    if (Filter.CheckCStringBufferOverlap) {
+      // Overlap!
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isuckatcs wrote:

Nit: I think this comment is redudant as `emitOverlapBug()` clearly tells us that we found an overlap. What do you think about removing it?

https://github.com/llvm/llvm-project/pull/113312