ac/nir: Fix include for LLVMAddPromoteMemoryToRegisterPass

Include llvm-c/Transforms/Utils.h with the newest LLVM 7

Signed-of-by: Mike Lothian <mike@fireburn.co.uk>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>
Signed-off-by: Marek Olšák <marek.olsak@amd.com>

src/amd/vulkan/radv_nir_to_llvm.c

@@ -32,6 +32,9 @@
 #include <llvm-c/Core.h>
 #include <llvm-c/TargetMachine.h>
 #include <llvm-c/Transforms/Scalar.h>
+#if HAVE_LLVM >= 0x0700
+#include <llvm-c/Transforms/Utils.h>
+#endif
 
 #include "sid.h"
 #include "gfx9d.h"