[NI-TESTS] Add regression tests

^KT-33638 Obsolete

Add test for case mentioned in KT-33629.
Used to be runtime failure instead of error diagnostic.

compiler/testData/codegen/box/regressions/kt33638.kt

@@ -0,0 +1,14 @@
+// !LANGUAGE: +NewInference
+// WITH_RUNTIME
+// KJS_WITH_FULL_RUNTIME
+// IGNORE_BACKEND_FIR: JVM_IR
+
+class Holder(val list: List<String>?)
+
+fun box(): String {
+    val holder1 = Holder(emptyList()) // No problem
+    val holder2 = Holder(if(true) emptyList<String>() else null) // No problem
+    val holder3 = Holder(if(true) emptyList() else mutableListOf()) // No problem
+    val holder4 = Holder(if(true) emptyList() else null) // Compile error
+    return "OK"
+}

compiler/testData/diagnostics/tests/inference/regressions/kt33629.fir.kt

@@ -0,0 +1,21 @@
+// !WITH_NEW_INFERENCE
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+fun <E> emptyList(): List<E> = TODO()
+
+data class IntervalTree(
+    val left: IntervalTree?,
+    val right: IntervalTree?,
+    val intervals: List<Interval>,
+    val median: Float
+)
+
+class Interval
+
+fun buildTree(segments: List<Interval>): IntervalTree? = TODO()
+fun acquireIntervals(): List<Interval> = TODO()
+
+fun main() {
+    buildTree(acquireIntervals())
+        ?: emptyList()
+}

compiler/testData/diagnostics/tests/inference/regressions/kt33629.kt

@@ -0,0 +1,21 @@
+// !WITH_NEW_INFERENCE
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+fun <E> emptyList(): List<E> = TODO()
+
+data class IntervalTree(
+    val left: IntervalTree?,
+    val right: IntervalTree?,
+    val intervals: List<Interval>,
+    val median: Float
+)
+
+class Interval
+
+fun buildTree(segments: List<Interval>): IntervalTree? = TODO()
+fun acquireIntervals(): List<Interval> = TODO()
+
+fun main() {
+    buildTree(acquireIntervals())
+        ?: <!OI;TYPE_INFERENCE_EXPECTED_TYPE_MISMATCH!><!NI;NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>emptyList<!>()<!>
+}

compiler/testData/diagnostics/tests/inference/regressions/kt33629.txt

@@ -0,0 +1,29 @@
+package
+
+public fun acquireIntervals(): kotlin.collections.List<Interval>
+public fun buildTree(/*0*/ segments: kotlin.collections.List<Interval>): IntervalTree?
+public fun </*0*/ E> emptyList(): kotlin.collections.List<E>
+public fun main(): kotlin.Unit
+
+public final class Interval {
+    public constructor Interval()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final data class IntervalTree {
+    public constructor IntervalTree(/*0*/ left: IntervalTree?, /*1*/ right: IntervalTree?, /*2*/ intervals: kotlin.collections.List<Interval>, /*3*/ median: kotlin.Float)
+    public final val intervals: kotlin.collections.List<Interval>
+    public final val left: IntervalTree?
+    public final val median: kotlin.Float
+    public final val right: IntervalTree?
+    public final operator /*synthesized*/ fun component1(): IntervalTree?
+    public final operator /*synthesized*/ fun component2(): IntervalTree?
+    public final operator /*synthesized*/ fun component3(): kotlin.collections.List<Interval>
+    public final operator /*synthesized*/ fun component4(): kotlin.Float
+    public final /*synthesized*/ fun copy(/*0*/ left: IntervalTree? = ..., /*1*/ right: IntervalTree? = ..., /*2*/ intervals: kotlin.collections.List<Interval> = ..., /*3*/ median: kotlin.Float = ...): IntervalTree
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}