LLVM build fix.

Change-Id: I3ab6677858c57c000f765d1119f3a13edba1b10d
diff --git a/src/compiler_llvm/jni_compiler.cc b/src/compiler_llvm/jni_compiler.cc
index 337d6e7..181f8c3 100644
--- a/src/compiler_llvm/jni_compiler.cc
+++ b/src/compiler_llvm/jni_compiler.cc
@@ -27,6 +27,7 @@
 #include "oat_compilation_unit.h"
 #include "runtime.h"
 #include "runtime_support_func.h"
+#include "stack.h"
 #include "utils_llvm.h"
 
 #include <llvm/BasicBlock.h>