Make isFromJava check work for SAM adapter extension descriptors (KT-21538)

Consider all callable descriptor in JavaClassDescriptor to be from Java.

This is used to check if smart step into should be intercepted by Kotlin
handler or delegated to Java.

 #KT-21538 Fixed

core/descriptors.jvm/src/org/jetbrains/kotlin/load/java/specialBuiltinMembers.kt

@@ -343,10 +343,10 @@ fun ClassDescriptor.hasRealKotlinSuperClassWithOverrideOf(
     return false
 }
 
-// Util methods
 val CallableMemberDescriptor.isFromJava: Boolean
-    get() = propertyIfAccessor.let { descriptor ->
-        (descriptor as? JavaCallableMemberDescriptor)?.containingDeclaration is JavaClassDescriptor
+    get() {
+        val descriptor = propertyIfAccessor
+        return descriptor.containingDeclaration is JavaClassDescriptor
     }
 
 fun CallableMemberDescriptor.isFromJavaOrBuiltins() = isFromJava || KotlinBuiltIns.isBuiltIn(this)

idea/testData/debugger/tinyApp/src/forTests/MyJavaClass.java

@@ -49,4 +49,9 @@ public class MyJavaClass {
     public static class RawADerived extends RawA {
 
     }
+
+    // Method with sam conversion for step into test
+    public void other(Runnable runnable) {
+        runnable.run();
+    }
 }

idea/testData/debugger/tinyApp/src/stepping/stepIntoAndSmartStepInto/javaSamFunction.kt

@@ -0,0 +1,9 @@
+package javaSamFunction
+
+import forTests.MyJavaClass
+
+fun main(args: Array<String>) {
+    val klass = MyJavaClass()
+    //Breakpoint!
+    klass.other { /* do nothing*/ }
+}

idea/testData/debugger/tinyApp/src/stepping/stepIntoAndSmartStepInto/javaSamFunction.out

@@ -0,0 +1,9 @@
+LineBreakpoint created at javaSamFunction.kt:8
+Run Java
+Connected to the target VM
+javaSamFunction.kt:8
+MyJavaClass.java:55
+resuming javaSamFunction.kt:8
+Disconnected from the target VM
+
+Process finished with exit code 0

idea/tests/org/jetbrains/kotlin/idea/debugger/KotlinSteppingTestGenerated.java

@@ -62,6 +62,12 @@ public class KotlinSteppingTestGenerated extends AbstractKotlinSteppingTest {
             doStepIntoTest(fileName);
         }
 
+        @TestMetadata("javaSamFunction.kt")
+        public void testJavaSamFunction() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/debugger/tinyApp/src/stepping/stepIntoAndSmartStepInto/javaSamFunction.kt");
+            doStepIntoTest(fileName);
+        }
+
         @TestMetadata("memberFunFromClass.kt")
         public void testMemberFunFromClass() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/debugger/tinyApp/src/stepping/stepIntoAndSmartStepInto/memberFunFromClass.kt");
@@ -149,6 +155,12 @@ public class KotlinSteppingTestGenerated extends AbstractKotlinSteppingTest {
             doSmartStepIntoTest(fileName);
         }
 
+        @TestMetadata("javaSamFunction.kt")
+        public void testJavaSamFunction() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/debugger/tinyApp/src/stepping/stepIntoAndSmartStepInto/javaSamFunction.kt");
+            doSmartStepIntoTest(fileName);
+        }
+
         @TestMetadata("memberFunFromClass.kt")
         public void testMemberFunFromClass() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/debugger/tinyApp/src/stepping/stepIntoAndSmartStepInto/memberFunFromClass.kt");