Remove setting explicit layer precision for layers that calculate shape tensors (#642)

Signed-off-by: Kevin Chen <kevinch@nvidia.com>

Author: kevinch-nv

ModelImporter.cpp

@@ -477,12 +477,10 @@ void removeShapeTensorCasts(IImporterContext* ctx)
         nvinfer1::ILayer* layer = ctx->network()->getLayer(i);
         if (layer->getNbOutputs() > 0 && layer->getOutput(0)->isShapeTensor())
         {
-            layer->resetPrecision();
             layer->resetOutputType(0);
             nvinfer1::ITensor& t = *layer->getOutput(0);
             // Assume that boolean tensors were not cast, and thus have their type correctly set.
             const nvinfer1::DataType shapeTensorType = t.getType() == nvinfer1::DataType::kBOOL ? nvinfer1::DataType::kBOOL : nvinfer1::DataType::kINT32;
-            layer->setPrecision(shapeTensorType);
             layer->setOutputType(0, shapeTensorType);
             // Set type only if necessary, to avoid TensorRT warnings
             // about setting type of non-input/output tensors.