IR: fix thisReceiver parameter type for function classes

Incorrect builder was used at line 269, which led to non-sensible type
in `IrClass.thisReceiver` for function types, such as
`SuspendFunction1<SuspendFunction1, SuspendFunction1>` in the linked
issue.

Avoid creating types manually completely to simplify this code and fix
the bug.

 #KT-49168 Fixed

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java

@@ -6752,6 +6752,11 @@ public class IrJsCodegenBoxES6TestGenerated extends AbstractIrJsCodegenBoxES6Tes
             runTest("compiler/testData/codegen/box/coroutines/kt46813.kt");
         }
 
+        @TestMetadata("kt49168.kt")
+        public void testKt49168() throws Exception {
+            runTest("compiler/testData/codegen/box/coroutines/kt49168.kt");
+        }
+
         @TestMetadata("lastExpressionIsLoop.kt")
         public void testLastExpressionIsLoop() throws Exception {
             runTest("compiler/testData/codegen/box/coroutines/lastExpressionIsLoop.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java

@@ -5981,6 +5981,11 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             runTest("compiler/testData/codegen/box/coroutines/kt46813.kt");
         }
 
+        @TestMetadata("kt49168.kt")
+        public void testKt49168() throws Exception {
+            runTest("compiler/testData/codegen/box/coroutines/kt49168.kt");
+        }
+
         @TestMetadata("lastExpressionIsLoop.kt")
         public void testLastExpressionIsLoop() throws Exception {
             runTest("compiler/testData/codegen/box/coroutines/lastExpressionIsLoop.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/testNew/IrJsCodegenBoxTestGenerated.java

@@ -6998,6 +6998,12 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/coroutines/kt46813.kt");
         }
 
+        @Test
+        @TestMetadata("kt49168.kt")
+        public void testKt49168() throws Exception {
+            runTest("compiler/testData/codegen/box/coroutines/kt49168.kt");
+        }
+
         @Test
         @TestMetadata("lastExpressionIsLoop.kt")
         public void testLastExpressionIsLoop() throws Exception {

js/js.tests/tests-gen/org/jetbrains/kotlin/js/testNew/JsCodegenBoxTestGenerated.java

@@ -6956,6 +6956,12 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/coroutines/kt46813.kt");
         }
 
+        @Test
+        @TestMetadata("kt49168.kt")
+        public void testKt49168() throws Exception {
+            runTest("compiler/testData/codegen/box/coroutines/kt49168.kt");
+        }
+
         @Test
         @TestMetadata("lastExpressionIsLoop.kt")
         public void testLastExpressionIsLoop() throws Exception {