Merge pull request #300 from Qining/fix-slow-down-in-no-contraction-propagation

Fix the slow down in noContraction propagation

glslang/MachineIndependent/propagateNoContraction.cpp

@@ -401,7 +401,7 @@ bool TSymbolDefinitionCollectingTraverser::visitBinary(glslang::TVisit /* visit
     } else {
         // For other binary nodes, still traverse the right node.
         current_object_.clear();
-        return true;
+        node->getRight()->traverse(this);
     }
     return false;
 }