[FIR] Support constructor call of unsigned in checker

compiler/testData/codegen/bytecodeText/constants/inlineUnsignedIntConstant.kt

@@ -1,5 +1,4 @@
 // !LANGUAGE: +InlineClasses
-// IGNORE_BACKEND_FIR: JVM_IR
 
 // FILE: uint.kt
 
@@ -9,6 +8,9 @@ inline class UInt(val value: Int)
 
 // FILE: test.kt
 
+//this import in required in FIR because default imports don't search in local sources atm
+import kotlin.UInt
+
 const val u = UInt(14)
 
 fun foo() {