JavaDescriptorResolver refactoring

* kill JavaDescriptorResolver.typeParameterDescriptorCache
* use ClassOrNamespaceDescriptor instead of DeclarationDescriptor

Code is a bit ugly now, but simpler than before.

compiler/testData/readJavaBinaryClass/MethosWithPRefTP.java

@@ -0,0 +1,5 @@
+package test;
+
+final class MethosWithPRefTP {
+    public final <P> void f(P p) {}
+}