patched register release issue

git-svn-id: https://svn.inf.ethz.ch/svn/lecturers/a2/trunk@6673 8c9fc860-2736-0410-a75d-ab315db34111

source/FoxIntermediateBackend.Mod

@@ -8927,6 +8927,7 @@ TYPE
 					IntermediateCode.MakeMemory(tag,addressType);
 				ELSE
 					tag := result.tag;
+					UseIntermediateOperand(tag);
 				END;
 				TypeTest(tag,x.type,trueL,falseL);
 				ReleaseIntermediateOperand(tag);