KT-45777: Don't compute snapshots for inaccessible classes

Also visit a class file with ASM once to extract all information we need
in advance, instead of visiting the class file each time some piece of
info is needed.

compiler/incremental-compilation-impl/testData/org/jetbrains/kotlin/incremental/classpathDiff/ClasspathSnapshotTestCommon/expected-snapshot/kotlin/com/example/SimpleKotlinClass.json

@@ -39,7 +39,7 @@
   },
   "supertypes": [
     {
-      "internalName": "kotlin/Any"
+      "internalName": "java/lang/Object"
     }
   ]
 }