Constant folding does not work for enum constants

ExtendJ 8.0.1-157-ge916427 Java SE 8

Constant expressions that use enum constants cause ExtendJ to crash when ExtendJ tries to fold the constant expression.

The following test case causes ExtendJ to crash:

import static runtime.Test.*;

public class Test {
  public static enum CatType {
    HOUSE, STRAY,
    LASAGNA, TOM,
    HAT, CHESHIRE
  }

  public static final String cat1 = "Cat in the " + CatType.HAT;
}

An UnsupportedOperationException is thrown:

    [junit] Compilation failed when expected to pass:
    [junit] Fatal exception:
    [junit] java.lang.UnsupportedOperationException: ConstantExpression operation constant not supported for type org.extendj.ast.EnumInstanceE
xpr
    [junit]     at org.extendj.ast.Expr.constant(Expr.java:561)
    [junit]     at org.extendj.ast.VarAccess.constant(VarAccess.java:443)
    [junit]     at org.extendj.ast.AbstractDot.constant(AbstractDot.java:297)
    [junit]     at org.extendj.ast.AddExpr.constant(AddExpr.java:271)
    [junit]     at org.extendj.ast.ConstantValueAttribute.<init>(ConstantValueAttribute.java:34)
    [junit]     at org.extendj.ast.FieldDeclarator.refined_Attributes_FieldDeclarator_attributes(FieldDeclarator.java:433)
    [junit]     at org.extendj.ast.FieldDeclarator.refined_AnnotationsCodegen_FieldDeclarator_attributes(FieldDeclarator.java:443)
    [junit]     at org.extendj.ast.FieldDeclarator.attributes_compute(FieldDeclarator.java:998)
    [junit]     at org.extendj.ast.FieldDeclarator.attributes(FieldDeclarator.java:986)
    [junit]     at org.extendj.ast.ClassDecl.generateClassfile(ClassDecl.java:166)

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