FAIL* works with LLVM 3.9, 4.0, 5.0 or 6.0

Change-Id: I5480c3451daac7c8ea6160a9afe5ce557b73afb1

src/core/util/llvmdisassembler/LLVMDisassembler.cpp

@@ -4,6 +4,14 @@ using namespace fail;
 using namespace llvm;
 using namespace llvm::object;
 
+// In LLVM 3.9, llvm::Triple::getArchTypeName() returns const char*, since LLVM
+// 4.0 it returns StringRef.  This overload catches the latter case.
+__attribute__((unused))
+static std::ostream& operator<<(std::ostream& stream, const llvm::StringRef& s)
+{
+	stream << s.str();
+	return stream;
+}
 
 LLVMtoFailTranslator *LLVMDisassembler::getTranslator() {
 	if (ltofail == 0) {

src/core/util/llvmdisassembler/LLVMDisassembler.hpp

@@ -23,7 +23,6 @@
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Support/TargetSelect.h"
-#include "llvm/Support/MemoryObject.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/ADT/StringExtras.h"