Handle java raw types in IR

Raw type Q is represented as a flexible type
  Q<B1, ... Bn> .. Q<*, ... *>
where Bi is a representative upper bound of the corresponding ith type
parameter of Q.
When mapping generic signature, JVM takes type arguments of lower bound
(which is 'Q<B1, ..., Bn>').

There is still some difference in how JVM and JVM_IR handle raw type in
signature. It requires additional investigation.

compiler/fir/fir2ir/tests/org/jetbrains/kotlin/fir/Fir2IrTextTestGenerated.java

@@ -2040,6 +2040,11 @@ public class Fir2IrTextTestGenerated extends AbstractFir2IrTextTest {
             runTest("compiler/testData/ir/irText/types/localVariableOfIntersectionType_NI.kt");
         }
 
+        @TestMetadata("rawTypeInSignature.kt")
+        public void testRawTypeInSignature() throws Exception {
+            runTest("compiler/testData/ir/irText/types/rawTypeInSignature.kt");
+        }
+
         @TestMetadata("receiverOfIntersectionType.kt")
         public void testReceiverOfIntersectionType() throws Exception {
             runTest("compiler/testData/ir/irText/types/receiverOfIntersectionType.kt");