Update test for the builder inference and add new ones

compiler/testData/codegen/box/inference/builderInference/intersect.kt

@@ -0,0 +1,49 @@
+// !LANGUAGE: +UnrestrictedBuilderInference
+// WITH_RUNTIME
+
+// FILE: Test.java
+
+class Test {
+    static <T> T foo(T x) { return x; }
+}
+
+// FILE: main.kt
+import kotlin.experimental.ExperimentalTypeInference
+
+@UseExperimental(ExperimentalTypeInference::class)
+fun <R1> build(@BuilderInference block: TestInterface<R1>.() -> Unit) {}
+
+@UseExperimental(ExperimentalTypeInference::class)
+fun <R2> build2(@BuilderInference block: TestInterface<R2>.() -> Unit) {}
+
+class In<in K>
+
+interface TestInterface<R> {
+    fun emit(r: R)
+    fun get(): R
+    fun getIn(): In<R>
+}
+
+fun <U> id(x: U) = x
+fun <E> intersect(vararg x: In<E>): E = null as E
+
+fun box(): String {
+    val ret = build {
+        emit("1")
+        intersect(getIn(), getIn())
+        intersect(getIn(), Test.foo(getIn()))
+        intersect(Test.foo(getIn()), Test.foo(getIn()))
+        intersect(Test.foo(getIn()), getIn())
+
+        build2 {
+            emit(1)
+            intersect(this@build.getIn(), getIn())
+            intersect(getIn(), Test.foo(this@build.getIn()))
+            intersect(Test.foo(this@build.getIn()), Test.foo(getIn()))
+            intersect(Test.foo(getIn()), this@build.getIn())
+            ""
+        }
+        ""
+    }
+    return "OK"
+}