[FIR] Use correct source for implicit this receiver

#KT-57489 Fixed
#KT-56139 Fixed
#KT-56755 Fixed

compiler/testData/debug/stepping/implicitThis.kt

@@ -0,0 +1,68 @@
+// FILE: test.kt
+
+fun box() {
+    A().test()
+}
+
+class A {
+    fun test() {
+        //Breakpoint!
+        foo()
+        prop
+        prop = 2
+    }
+
+    companion object {
+        private fun foo() {
+            val a = 1
+        }
+
+        private var prop: Int = 2
+            get() {
+                return 1
+            }
+            set(i: Int) {
+                field = i
+            }
+    }
+}
+
+// EXPECTATIONS JVM JVM_IR
+// test.kt:4 box
+// test.kt:20 <clinit>
+// test.kt:15 <init>
+// test.kt:20 <clinit>
+// test.kt:20 <clinit>
+// test.kt:4 box
+
+// test.kt:7 <init>
+// test.kt:4 box
+// test.kt:10 test
+// test.kt:17 foo
+// test.kt:18 foo
+// test.kt:11 test
+// test.kt:22 getProp
+// test.kt:11 test
+// test.kt:12 test
+// test.kt:25 setProp
+// test.kt:26 setProp
+// test.kt:13 test
+// test.kt:5 box
+
+// EXPECTATIONS JS_IR
+// test.kt:4 box
+// test.kt:7 <init>
+// test.kt:20 <init>
+// test.kt:15 <init>
+// test.kt:7 <init>
+// test.kt:4 box
+// test.kt:10 test
+// test.kt:10 test
+// test.kt:17 foo
+// test.kt:18 foo
+// test.kt:11 test
+// test.kt:11 test
+// test.kt:22 <get-prop>
+// test.kt:12 test
+// test.kt:13 test
+// test.kt:5 box