Fix perfo Venice (shadow).

Normand Briere

2019-06-27 1807e7752960ac229cddd34b100e92cadbac9459

 LA.java
..
..
@@ -88,6 +88,9 @@
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     static void vecCopy(cVector a, cVector b)
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     {
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+        Grafreed.Assert (a != null);
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+        assert (b != null);
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+        
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         b.x = a.x;
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         b.y = a.y;
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         b.z = a.z;