Update LLVM dep (#437)

* Fix compile

diff --git a/lib/Compiler.cpp b/lib/Compiler.cpp
index f46593f..bf7274a 100644
--- a/lib/Compiler.cpp
+++ b/lib/Compiler.cpp
@@ -22,6 +22,7 @@
 #include "llvm/IR/LegacyPassManager.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/Verifier.h"
+#include "llvm/InitializePasses.h"
 #include "llvm/LinkAllPasses.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/CommandLine.h"