Update LLVM dep (#441)

* Fix some missing includes
diff --git a/lib/ShareModuleScopeVariables.cpp b/lib/ShareModuleScopeVariables.cpp
index 61f754c..c9cde68 100644
--- a/lib/ShareModuleScopeVariables.cpp
+++ b/lib/ShareModuleScopeVariables.cpp
@@ -20,6 +20,7 @@
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/Module.h"
 #include "llvm/Pass.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/raw_ostream.h"
 
 #include "clspv/AddressSpace.h"