[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/shadowing/ShadowParameterInNestedBlockInFor.fir.kt

@@ -0,0 +1,7 @@
+fun f(i: Int) {
+    for (j in 1..100) {
+        {
+            var i = 12
+        }
+    }
+}