[truffle] Implement boolification of hashes

Author: pmurias

src/vm/jvm/runtime/org/perl6/nqp/truffle/nodes/NQPToBooleanNode.java

@@ -7,6 +7,7 @@
 import org.perl6.nqp.truffle.sixmodel.reprs.FixedSizeObject;
 import org.perl6.nqp.truffle.sixmodel.reprs.VMIterInstance;
 import org.perl6.nqp.truffle.sixmodel.reprs.VMArrayInstance;
+import org.perl6.nqp.truffle.runtime.NQPHash;
 
 public abstract class NQPToBooleanNode extends NQPBaseNode {
     public abstract boolean executeBoolean(Object value);
@@ -31,6 +32,11 @@ protected boolean doVMArrayInstance(VMArrayInstance value) {
         return value.elems() != 0;
     }
 
+    @Specialization
+    protected boolean doHash(NQPHash value) {
+        return value.elems() != 0;
+    }
+
     @Specialization
     protected boolean doVMIterInstance(VMIterInstance value) {
         return ((VMIterInstance) value).boolify();