kfdtest: Add required LLVM header

A function call was refactored out of CommandLine.h, so add the header
to include it

Change-Id: If5594e3abc2fdfdd59f108c4379802cedab127ee
Signed-off-by: Kent Russell <kent.russell@amd.com>
Signed-off-by: Chris Freehill <cfreehil@amd.com>

libhsakmt/tests/kfdtest/src/Assemble.cpp

@@ -69,6 +69,9 @@
 #else
 #include <llvm/Support/TargetRegistry.h>
 #endif
+#if LLVM_VERSION_MAJOR > 18
+#include "llvm/Support/ManagedStatic.h"
+#endif
 
 #include <linux/elf.h>
 #include "OSWrapper.hpp"