FIR: in case of smart cast, use original type for FirThisRcvrExpression

Before this commit, we used type after smart cast both for original
FirThisReceiverExpression and for wrapping FirExpressionWithSmartCast.
However, this makes FIR2IR implicit cast generator work incorrectly
(it decides not to insert implicit cast because original type is the same).
After this commit, expressions have different types and implicit cast
generator works properly.

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/ir/IrTextTestGenerated.java

@@ -2176,6 +2176,12 @@ public class IrTextTestGenerated extends AbstractIrTextTest {
             runTest("compiler/testData/ir/irText/firProblems/SignatureClash.kt");
         }
 
+        @Test
+        @TestMetadata("SimpleTypeMarker.kt")
+        public void testSimpleTypeMarker() throws Exception {
+            runTest("compiler/testData/ir/irText/firProblems/SimpleTypeMarker.kt");
+        }
+
         @Test
         @TestMetadata("SyntheticSetterType.kt")
         public void testSyntheticSetterType() throws Exception {