[antlr-interest] Literals not handled in grammars with import

[Thomas Brandon]

In 31, imported literals are not being handled correctly in tree
grammars utilising import.

Given the included grammars, while TestTree.g works properly, in
TestTree2.g the literals are not correctly imported and new token
types are assigned. This occurs in both rules from the imported
grammar (tok1 in TestTree2_TestTree.java) and new rules in the
importing grammar (tok1_2 in TestTree2.java).

Tom.

<Test.g>
grammar Test;

tok1: 'tok1';
</Test.g>

<TestTree.g>
tree grammar TestTree;

options {
	tokenVocab=Test;
	ASTLabelType = CommonTree;
}

tok1:
	'tok1'
	;
</Test2.g>

<TestTree2.g>
tree grammar TestTree2;

options {
	tokenVocab=Test;
	ASTLabelType = CommonTree;
}

import TestTree;

tok1_2:
	'tok1'
	;
</TestTree2.g>
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