[FIR2IR] Fix check if interface is SAM

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/ConversionUtils.kt

@@ -470,7 +470,8 @@ fun FirClass<*>.irOrigin(firProvider: FirProvider): IrDeclarationOrigin = when {
 }
 
 fun FirClass<*>.getSamIfAny(): FirSimpleFunction? =
-    declarations.filterIsInstance<FirSimpleFunction>().singleOrNull { it.modality == Modality.ABSTRACT }
+    declarations.filterIsInstance<FirSimpleFunction>()
+        .singleOrNull { it.modality == Modality.ABSTRACT && !it.isPublicInObject(checkOnlyName = true) }
 
 val IrType.isSamType: Boolean
     get() {

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/SamResolution.kt

@@ -316,7 +316,7 @@ private fun FirRegularClass.hasMoreThenOneAbstractFunctionOrHasAbstractProperty(
 // "methods that are members of I that do not have the same signature as any public instance method of the class Object"
 // It means that if an interface declares `int hashCode()` then the method won't be taken into account when
 // checking if the interface is SAM.
-private fun FirSimpleFunction.isPublicInObject(checkOnlyName: Boolean): Boolean {
+fun FirSimpleFunction.isPublicInObject(checkOnlyName: Boolean): Boolean {
     if (name.asString() !in PUBLIC_METHOD_NAMES_IN_OBJECT) return false
     if (checkOnlyName) return true
 

compiler/testData/codegen/box/callableReference/function/sortListOfStrings.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // WITH_RUNTIME
 // KJS_WITH_FULL_RUNTIME
 

compiler/testData/codegen/box/sam/constructors/comparator.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // WITH_RUNTIME
 // KJS_WITH_FULL_RUNTIME
 

compiler/testData/codegen/box/sam/constructors/nonLiteralComparator.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // WITH_RUNTIME
 // KJS_WITH_FULL_RUNTIME