Add tests making sure that a couple of issues are fixed by PCLA

^KT-49283 Fixed
^KT-64077 Fixed

compiler/testData/codegen/box/builderInference/issues/kt49283.kt

@@ -0,0 +1,18 @@
+// TARGET_BACKEND: JVM_IR
+// WITH_STDLIB
+// ISSUE: KT-49283
+
+// IGNORE_BACKEND_K1: ANY
+
+fun takeListOfStrings(x: List<String>) {}
+
+fun box(): String {
+    val result = buildList l1@ { // Not enough information to infer type variable E, but could be inferred into String
+        val anotherList = buildList {
+            takeListOfStrings(this)
+            this@l1.add("OK")
+        }
+    }
+
+    return result[0]
+}