Fix smart step into to Kotlin SAM adapter (KT-21538)

#KT-21538 Fixed

idea/src/org/jetbrains/kotlin/idea/debugger/stepping/KotlinBasicStepMethodFilter.kt

@@ -22,6 +22,7 @@ import com.intellij.util.Range
 import com.intellij.util.SofterReference
 import com.sun.jdi.Location
 import org.jetbrains.kotlin.builtins.functions.FunctionInvokeDescriptor
+import org.jetbrains.kotlin.codegen.SamCodegenUtil
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.CallableMemberDescriptor.Kind.*
 import org.jetbrains.kotlin.idea.caches.resolve.resolveToDescriptorIfAny
@@ -44,7 +45,9 @@ class KotlinBasicStepMethodFilter(
         else -> targetDescriptor.name.asString()
     }
 
-    private val _targetDescriptor = SofterReference(targetDescriptor)
+    private val _targetDescriptor = SofterReference(
+            (targetDescriptor as? FunctionDescriptor)?.let { SamCodegenUtil.getOriginalIfSamAdapter(it) } ?: targetDescriptor
+    )
 
     override fun getCallingExpressionLines() = myCallingExpressionLines
 

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

@@ -0,0 +1,15 @@
+package kotlinSamFunction
+
+import forTests.MyJavaClass
+
+class KotlinSubclass : MyJavaClass() {
+    override fun other(runnable: Runnable) {
+        super.other(runnable)
+    }
+}
+
+fun main(args: Array<String>) {
+    val klass = KotlinSubclass()
+    //Breakpoint!
+    klass.other { /* do nothing*/ }
+}

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

@@ -0,0 +1,9 @@
+LineBreakpoint created at kotlinSamFunction.kt:14
+Run Java
+Connected to the target VM
+kotlinSamFunction.kt:14
+kotlinSamFunction.kt:7
+resuming kotlinSamFunction.kt:14
+Disconnected from the target VM
+
+Process finished with exit code 0

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

@@ -74,6 +74,12 @@ public class KotlinSteppingTestGenerated extends AbstractKotlinSteppingTest {
             doStepIntoTest(fileName);
         }
 
+        @TestMetadata("kotlinSamFunction.kt")
+        public void testKotlinSamFunction() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/debugger/tinyApp/src/stepping/stepIntoAndSmartStepInto/kotlinSamFunction.kt");
+            doStepIntoTest(fileName);
+        }
+
         @TestMetadata("memberFunFromClass.kt")
         public void testMemberFunFromClass() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/debugger/tinyApp/src/stepping/stepIntoAndSmartStepInto/memberFunFromClass.kt");
@@ -173,6 +179,12 @@ public class KotlinSteppingTestGenerated extends AbstractKotlinSteppingTest {
             doSmartStepIntoTest(fileName);
         }
 
+        @TestMetadata("kotlinSamFunction.kt")
+        public void testKotlinSamFunction() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/debugger/tinyApp/src/stepping/stepIntoAndSmartStepInto/kotlinSamFunction.kt");
+            doSmartStepIntoTest(fileName);
+        }
+
         @TestMetadata("memberFunFromClass.kt")
         public void testMemberFunFromClass() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/debugger/tinyApp/src/stepping/stepIntoAndSmartStepInto/memberFunFromClass.kt");