[clang] [NFC][analyzer] Remove StmtNodeBuilder (PR #181431)

[Donát Nagy via cfe-commits]

================
@@ -267,8 +260,9 @@ class NodeBuilder {
   NodeBuilder(const ExplodedNodeSet &SrcSet, ExplodedNodeSet &DstSet,
               const NodeBuilderContext &Ctx)
       : C(Ctx), Frontier(DstSet) {
-    Frontier.insert(SrcSet);
-    assert(hasNoSinksInFrontier());
+    for (ExplodedNode *Node : SrcSet)
+      if (!Node->isSink())
+        Frontier.insert(Node);
   }
----------------
NagyDonat wrote:

Anyway, I'm removing this commit from this PR and moving it to my next PR, because I realized that this change is not logically related to the removal of `StmtNodeBuilder` but it is related to my next change.

https://github.com/llvm/llvm-project/pull/181431