Add tests for obsolete issues

#KT-38092 Obsolete
 #KT-38179 Obsolete
 #KT-35105 Obsolete
 #KT-36696 Obsolete
 #KT-36947 Obsolete
 #KT-37337 Obsolete
 #KT-37309 Obsolete
 #KT-37727 Obsolete
 #KT-37735 Obsolete
 #KT-37853 Obsolete
 #KT-37920 Obsolete
 #KT-37709 Obsolete
 #KT-37706 Obsolete

compiler/testData/codegen/box/inference/earlyReturnInsideCrossinlineLambda.kt

@@ -0,0 +1,15 @@
+inline fun <T> runReadAction(crossinline runnable: () -> T): T = runnable()
+
+class Foo {
+    fun <K> infer(): K = "OK" as K
+}
+
+fun bar(): Int? = 42
+
+fun box(): String {
+    return runReadAction {
+        bar() ?: return@runReadAction "Failed"
+        val foo = Foo()
+        foo.infer()
+    }
+}

compiler/testData/codegen/box/operatorConventions/plusAssignWithComplexRHS.kt

@@ -0,0 +1,10 @@
+// KJS_WITH_FULL_RUNTIME
+// WITH_RUNTIME
+// IGNORE_BACKEND_FIR: JVM_IR
+
+var map: Map<Any, Set<Any>> = emptyMap()
+
+fun box(): String {
+    map += "OK" to emptySet()
+    return map.keys.first().toString()
+}