removing attributes using constant layouts

...tin/src/com/oracle/truffle/r/nodes/builtin/base/Attr.java

...m/oracle/truffle/r/nodes/builtin/base/UpdateDimNames.java

...oracle/truffle/r/nodes/attributes/CopyAttributesNode.java

.../truffle/r/nodes/attributes/FixedAttributeAccessNode.java

...cle/truffle/r/nodes/attributes/GetFixedAttributeNode.java

.../truffle/r/nodes/attributes/RemoveFixedAttributeNode.java

...cle/truffle/r/nodes/attributes/SetFixedAttributeNode.java

...e/truffle/r/nodes/attributes/UnaryCopyAttributesNode.java

...truffle/r/nodes/attributes/UpdateSharedAttributeNode.java

...src/com/oracle/truffle/r/nodes/objects/GetS4DataSlot.java

.../com/oracle/truffle/r/runtime/data/RAttributesLayout.java