Ensure TypeSymbols.getRuntimePackage receives a type and not a name

Using `Symbol<Type>` makes this checked at compilation time.

Author: gilles-duboscq

espresso-shared/src/com.oracle.truffle.espresso.classfile/src/com/oracle/truffle/espresso/classfile/descriptors/TypeSymbols.java

@@ -454,7 +454,11 @@ public static Symbol<Name> toClassNameEntry(Symbol<Type> type, ParserConstantPoo
         return symbolify.apply(className);
     }
 
-    public static ByteSequence getRuntimePackage(ByteSequence symbol) {
+    public static ByteSequence getRuntimePackage(Symbol<Type> symbol) {
+        return TypeSymbols.getRuntimePackage((ByteSequence) symbol);
+    }
+
+    private static ByteSequence getRuntimePackage(ByteSequence symbol) {
         if (symbol.byteAt(0) == '[') {
             int arrayDimensions = getArrayDimensions(symbol);
             return getRuntimePackage(symbol.subSequence(arrayDimensions));