[SYCL] Improve kernel demangling in graph printing (#2282)

Update demangling to work when toolchain is built with Clang.

Signed-off-by: Alexander Batashev <[email protected]>

Author: alexbatashev

sycl/source/detail/scheduler/commands.cpp

@@ -30,11 +30,14 @@
 #include <string>
 #include <vector>
 
-#ifdef __GNUG__
+#ifdef __has_include
+#if __has_include(<cxxabi.h>)
+#define __SYCL_ENABLE_GNU_DEMANGLING
 #include <cstdlib>
 #include <cxxabi.h>
 #include <memory>
 #endif
+#endif
 
 #ifdef XPTI_ENABLE_INSTRUMENTATION
 #include "xpti_trace_framework.hpp"
@@ -49,7 +52,7 @@ namespace detail {
 extern xpti::trace_event_data_t *GSYCLGraphEvent;
 #endif
 
-#ifdef __GNUG__
+#ifdef __SYCL_ENABLE_GNU_DEMANGLING
 struct DemangleHandle {
   char *p;
   DemangleHandle(char *ptr) : p(ptr) {}