Added EngineBuilder.

Added test/enginebuilder.

llvm/llvm_c_extra.h

@@ -0,0 +1,29 @@
+#ifndef LLVM_C_EXTRA_H_
+#define LLVM_C_EXTRA_H_
+
+#include <llvm-c/Core.h>
+
+
+#ifdef __cplusplus
+    extern "C" {
+#endif
+
+// Resurrect from llvm-c/Core.h
+#define DEFINE_SIMPLE_CONVERSION_FUNCTIONS(ty, ref)     \
+inline ty *unwrap(ref P) {                              \
+    return reinterpret_cast<ty*>(P);                    \
+}                                                       \
+                                                        \
+inline ref wrap(const ty *P) {                          \
+    return reinterpret_cast<ref>(const_cast<ty*>(P));   \
+}
+
+typedef struct LLVMOpaqueEngineBuilder *LLVMEngineBuilderRef;
+
+
+#ifdef __cplusplus
+    }
+#endif
+
+#endif  //LLVM_C_EXTRA_H_
+