JS: do not alias 'this' literal in a receiver position

js/js.inliner/src/org/jetbrains/kotlin/js/inline/FunctionInlineMutator.kt

@@ -68,7 +68,7 @@ class FunctionInlineMutator private (private val call: JsInvocation, private val
         if (!hasThisReference(body)) return
 
         var thisReplacement = getThisReplacement(call)
-        if (thisReplacement == null) return
+        if (thisReplacement == null || thisReplacement is JsLiteral.JsThisRef) return
 
         if (thisReplacement!!.needToAlias()) {
             val thisName = namingContext.getFreshName(getThisAlias())

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/InlineSizeReductionTestGenerated.java

@@ -53,6 +53,12 @@ public class InlineSizeReductionTestGenerated extends AbstractInlineSizeReductio
         doTest(fileName);
     }
 
+    @TestMetadata("this.kt")
+    public void testThis() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("js/js.translator/testData/inlineSizeReduction/cases/this.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("valAssignment.kt")
     public void testValAssignment() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("js/js.translator/testData/inlineSizeReduction/cases/valAssignment.kt");

js/js.translator/testData/inlineSizeReduction/cases/this.kt

@@ -0,0 +1,19 @@
+package foo
+
+// CHECK_CONTAINS_NO_CALLS: test
+// CHECK_VARS_COUNT: function=test count=0
+
+class A(val x: Int) {
+    inline fun f(): Int = x
+
+    inline fun ff(): Int = f()
+}
+
+fun test(a: A): Int = a.ff()
+
+fun box(): String {
+    assertEquals(1, test(A(1)))
+    assertEquals(2, test(A(2)))
+
+    return "OK"
+}