Be able to infer a type variable based on several builder inference lambdas

^KT-48329 Fixed

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

@@ -0,0 +1,63 @@
+// WITH_RUNTIME
+// DONT_TARGET_EXACT_BACKEND: WASM
+// IGNORE_BACKEND_FIR: JVM_IR
+// TARGET_BACKEND: JVM
+
+import kotlin.experimental.ExperimentalTypeInference
+
+class In<in K> {
+    fun contribute(x: K) {}
+}
+
+class Out<out K> {
+    fun get(): K = null as K
+}
+
+class Inv<K> {
+    fun get(): K = null as K
+}
+
+interface A
+class B: A
+class C: A
+
+@OptIn(ExperimentalTypeInference::class)
+fun <K> build1(@BuilderInference builderAction1: In<K>.() -> Unit, @BuilderInference builderAction2: In<K>.() -> Unit): K = 1 as K
+
+@OptIn(ExperimentalTypeInference::class)
+fun <K> build2(@BuilderInference builderAction1: In<K>.() -> Unit, @BuilderInference builderAction2: In<K>.() -> Unit): K = B() as K
+
+@OptIn(ExperimentalTypeInference::class)
+fun <K> build3(@BuilderInference builderAction1: Out<K>.() -> Unit, @BuilderInference builderAction2: Out<K>.() -> Unit): K = 1 as K
+
+@OptIn(ExperimentalTypeInference::class)
+fun <K> build4(@BuilderInference builderAction1: Out<K>.() -> Unit, @BuilderInference builderAction2: Out<K>.() -> Unit): K = B() as K
+
+@OptIn(ExperimentalTypeInference::class)
+fun <K> build5(@BuilderInference builderAction1: Inv<K>.() -> Unit, @BuilderInference builderAction2: Inv<K>.() -> Unit): K = 1 as K
+
+@OptIn(ExperimentalTypeInference::class)
+fun <K> build6(@BuilderInference builderAction1: Inv<K>.() -> Unit, @BuilderInference builderAction2: Inv<K>.() -> Unit): K = B() as K
+
+@OptIn(ExperimentalStdlibApi::class)
+fun box(): String {
+    val x1 = build1({ contribute(1f) }, { contribute(1.0) })
+    <!DEBUG_INFO_EXPRESSION_TYPE("{Comparable<*> & Number}")!>x1<!>
+
+    val y1 = build2({ contribute(B()) }, { contribute(C()) })
+    <!DEBUG_INFO_EXPRESSION_TYPE("A")!>y1<!>
+
+    val x2 = build3({ val x: Float = get() }, { val x: Double = get() })
+    <!DEBUG_INFO_EXPRESSION_TYPE("{Comparable<*> & Number}")!>x2<!>
+
+    val y2 = build4({ val x: B = get() }, { val x: C = get() })
+    <!DEBUG_INFO_EXPRESSION_TYPE("A")!>y2<!>
+
+    val x3 = build3({ val x: Float = get() }, { val x: Double = get() })
+    <!DEBUG_INFO_EXPRESSION_TYPE("{Comparable<*> & Number}")!>x2<!>
+
+    val y3 = build4({ val x: B = get() }, { val x: C = get() })
+    <!DEBUG_INFO_EXPRESSION_TYPE("A")!>y2<!>
+
+    return "OK"
+}