Re-privatizing 'MKernel' for backward compatibility

- Allowing access 'MKernel' from sycl::handler class
- +Reverting unnecessary std:move for Kernel function

Author: dongkyunahn-intel

sycl/include/CL/sycl/detail/cg_types.hpp

@@ -245,9 +245,12 @@ class HostTask {
 template <class KernelType, class KernelArgType, int Dims, typename KernelName>
 class HostKernel : public HostKernelBase {
   using IDBuilder = sycl::detail::Builder;
+  KernelType MKernel;
+  // Allowing accessing MKernel from 'ResetHostKernelHelper' method of
+  // 'sycl::handler'
+  friend class sycl::handler;
 
 public:
-  KernelType MKernel;
   HostKernel(KernelType Kernel) : MKernel(Kernel) {}
   void call(const NDRDescT &NDRDesc, HostProfilingInfo *HPI) override {
     // adjust ND range for serial host:

sycl/include/CL/sycl/handler.hpp

@@ -1434,7 +1434,7 @@ class __SYCL_EXPORT handler {
     // known constant.
     MNDRDesc.set(range<1>{1});
 
-    StoreLambda<NameT, KernelType, /*Dims*/ 0, void>(std::move(KernelFunc));
+    StoreLambda<NameT, KernelType, /*Dims*/ 0, void>(KernelFunc);
     setType(detail::CG::Kernel);
 #endif
   }