Merge pull request #1255 from billhollings/vizbuff-index

Fix Metal validation error of duplicate visibility offsets.
diff --git a/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm b/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm
index c2be00b..74df97d 100644
--- a/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm
+++ b/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm
@@ -1396,7 +1396,6 @@
         _metalFeatures.multisampleArrayTextures = true;
 		_metalFeatures.events = true;
         _metalFeatures.textureBuffers = true;
-		_metalFeatures.simdPermute = true;
     }
 
 	if (supportsMTLFeatureSet(macOS_GPUFamily2_v1)) {
@@ -1404,6 +1403,7 @@
 		_metalFeatures.stencilFeedback = true;
 		_metalFeatures.depthResolve = true;
 		_metalFeatures.stencilResolve = true;
+		_metalFeatures.simdPermute = true;
 		_metalFeatures.quadPermute = true;
 		_metalFeatures.simdReduction = true;
 	}