[Decompiler - New IR] Add AtomicOp (#181)

* wip decompiler ir

* add AtomicOp stuff

* fix windows build and warnings

* add instruction parser

* include

* make minilzo shared

* odr fix

* a

* fix merge conflicts

* move decompiler into namespace

* update the code coverage to include the decompiler

* add demo test

* add register use test to example test

decompiler/IR2/Env.cpp

@@ -0,0 +1,10 @@
+#include <stdexcept>
+#include "Env.h"
+
+namespace decompiler {
+std::string Env::get_variable_name(Register reg, int atomic_idx) const {
+  (void)reg;
+  (void)atomic_idx;
+  throw std::runtime_error("Env::get_variable_name not yet implemented.");
+}
+}  // namespace decompiler