JVM_IR: special case for raw types in DescriptorMangleComputer

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/mangle/descriptor/DescriptorMangleComputer.kt

@@ -206,7 +206,7 @@ abstract class DescriptorMangleComputer(protected val builder: StringBuilder, pr
                     val lower = type.lowerBound
                     val lowerDescriptor = lower.constructor.declarationDescriptor as? ClassDescriptor
                         ?: error("No class descriptor for lower type $lower of $type")
-                    val intermediate = if (lowerDescriptor == upperDescriptor) {
+                    val intermediate = if (lowerDescriptor == upperDescriptor && type !is RawType) {
                         lower.replace(newArguments = upper.arguments)
                     } else lower
                     val mixed = intermediate.makeNullableAsSpecified(upper.isMarkedNullable)

compiler/testData/codegen/boxInline/signatureMangling/rawType.kt

@@ -1,16 +1,22 @@
 // TARGET_BACKEND: JVM_IR
 // WITH_RUNTIME
-// FILE: UseRawType.java
-import java.util.List;
+// FILE: C.java
+public class C<T> {
+    T val;
 
-public class UseRawType {
-    static public List useList(List arg) {
-        return arg;
-    }
+    public C(T val) { this.val = val; }
+
+    public T getVal() { return val; }
 }
 
-// FILE: use.kt
-inline fun callRawType() = UseRawType.useList(listOf("OK")) as List<String>
+// FILE: UseRaw.java
+public class UseRaw {
+    static public C cId(C c) { return c; }
 
+    static public void cId() {} // DescriptorByIdSignatureFinder only checks ID if there are multiple functions with a given name.
+}
+// FILE: inlineCall.kt
+inline fun inlineCallRaw(s: String): String =
+   (UseRaw.cId(C(s)) as C<String>).getVal()
 // FILE: box.kt
-fun box() = callRawType()[0]
+fun box() = inlineCallRaw("OK")