[FIR-TEST] Move analysis tests to separate module

compiler/fir/analysis-tests/testData/resolveWithStdlib/backingField.kt

@@ -0,0 +1,7 @@
+var myProperty = listOf(1, 2, 3)
+    get() {
+        return field + field
+    }
+    set(param) {
+        field = param
+    }