Partially fixes tensorflow#10838 (tensorflow#12564)

Author: byronyi

tensorflow/core/framework/op_kernel.h

@@ -310,7 +310,7 @@ class OpKernelConstruction {
   FunctionLibraryRuntime* function_library() const { return flib_; }
 
   // The GraphDef version whose behavior we should follow.
-  const int graph_def_version() const { return graph_def_version_; }
+  int graph_def_version() const { return graph_def_version_; }
 
   // Helper routines for the OP_REQUIRES macros
   void CtxFailure(Status s);

tensorflow/stream_executor/device_description.h

@@ -82,7 +82,7 @@ class DeviceDescription {
 
   // Returns the limit on the number of simultaneously resident blocks
   // on a multiprocessor.
-  const uint64 blocks_per_core_limit() const { return blocks_per_core_limit_; }
+  uint64 blocks_per_core_limit() const { return blocks_per_core_limit_; }
 
   // Returns the limit on the total number of threads that can be launched in a
   // single block; i.e. the limit on x * y * z dimensions of a ThreadDim.
@@ -141,7 +141,7 @@ class DeviceDescription {
   uint64 device_memory_size() const { return device_memory_size_; }
 
   // Returns the device's core clock rate in GHz.
-  const float clock_rate_ghz() const { return clock_rate_ghz_; }
+  float clock_rate_ghz() const { return clock_rate_ghz_; }
 
   // Returns whether ECC is enabled.
   bool ecc_enabled() const { return ecc_enabled_; }

tensorflow/stream_executor/kernel.h

@@ -302,7 +302,7 @@ class KernelArgIterator {
   //
   // Returns a default-constructed KernelArg if there is no next argument.
   KernelArg next() {
-    KernelArg result;
+    KernelArg result = {};
     if (!has_next()) {
       return result;
     } else if ((shmem_indices_iter_ != shmem_indices_end_) &&