Fix leaking top level logical assignment

Author: Kingwl

src/compiler/binder.ts

@@ -1039,7 +1039,6 @@ namespace ts {
                 node = node.parent;
             }
             return !isStatementCondition(node) &&
-                !isLogicalAssignmentExpression(node.parent) &&
                 !isLogicalExpression(node.parent) &&
                 !(isOptionalChain(node.parent) && node.parent.expression === node);
         }

tests/cases/conformance/esnext/logicalAssignment/logicalAssignment11.ts

@@ -0,0 +1,13 @@
+// @strict: true
+// @target: esnext, es2020, es2015
+
+let x: string | undefined;
+
+// let d: string | undefined;
+// d ?? (d = x ?? "x")
+// d.length;
+
+
+let e: string | undefined;
+e ??= x ?? "x"
+e.length