[SYCL] Fix compilation of sycl application with default compiler.

This patch fixes compilation of sycl application with default
compiler(without specifying -fsycl). To do this default KernelInfo
implementation is added + check that skips integration header
processing if specialization for KernelInfo(which is supposed to
come from integraion header) is not available.

Signed-off-by: Vlad Romanov <[email protected]>

Author: romanovvlad

sycl/include/CL/sycl/detail/kernel_desc.hpp

@@ -36,7 +36,14 @@ struct kernel_param_desc_t {
   int offset;
 };
 
-template <class KernelNameType> struct KernelInfo;
+template <class KernelNameType> struct KernelInfo {
+  static constexpr unsigned getNumParams() { return 0; }
+  static const kernel_param_desc_t &getParamDesc(int Idx) {
+    static kernel_param_desc_t Dummy;
+    return Dummy;
+  }
+  static constexpr const char *getName() { return ""; }
+};
 
 } // namespace detail
 } // namespace sycl

sycl/include/CL/sycl/handler2.hpp

@@ -513,11 +513,13 @@ class handler {
     using KI = sycl::detail::KernelInfo<KernelName>;
     // Empty name indicates that the compilation happens without integration
     // header, so don't perform things that require it.
-    MArgs.clear();
-    extractArgsAndReqsFromLambda(MHostKernel->getPtr(), KI::getNumParams(),
-                                 &KI::getParamDesc(0));
-    MKernelName = KI::getName();
-    MOSModuleHandle = csd::OSUtil::getOSModuleHandle(KI::getName());
+    if (KI::getName() != "") {
+      MArgs.clear();
+      extractArgsAndReqsFromLambda(MHostKernel->getPtr(), KI::getNumParams(),
+                                   &KI::getParamDesc(0));
+      MKernelName = KI::getName();
+      MOSModuleHandle = csd::OSUtil::getOSModuleHandle(KI::getName());
+    }
   }
 
   // single_task version with a kernel represented as a lambda.