Reducing Warnings in DNN sources

.../projects/hpvm-tensor-rt/dnn_sources/src/pipeline_GEMO.cc

llvm/projects/hpvm-tensor-rt/dnn_sources/src/pipeline_GEO.cc

.../projects/hpvm-tensor-rt/dnn_sources/src/pipeline_GEOM.cc

llvm/projects/hpvm-tensor-rt/dnn_sources/src/pipeline_GSM.cc

.../projects/hpvm-tensor-rt/dnn_sources/src/pipeline_GSME.cc

...ensor-rt/dnn_sources/src/promise/pipeline_GEMO_promise.cc

...-tensor-rt/dnn_sources/src/promise/pipeline_GEMO_valid.cc

...ensor-rt/dnn_sources/src/promise/pipeline_GEOM_promise.cc

...-tensor-rt/dnn_sources/src/promise/pipeline_GEOM_valid.cc

...tensor-rt/dnn_sources/src/promise/pipeline_GEO_promise.cc

...m-tensor-rt/dnn_sources/src/promise/pipeline_GEO_valid.cc

...ensor-rt/dnn_sources/src/promise/pipeline_GSME_promise.cc

...-tensor-rt/dnn_sources/src/promise/pipeline_GSME_valid.cc

...tensor-rt/dnn_sources/src/promise/pipeline_GSM_promise.cc

...m-tensor-rt/dnn_sources/src/promise/pipeline_GSM_valid.cc

...pvm-tensor-rt/tensor_runtime/include/half_precision_api.h

...jects/hpvm-tensor-rt/tensor_runtime/src/tensor_runtime.cu