[decompiler] Jak 2 modifications, new all-types code (#1553)

* temp

* look at old game types

* clean up

decompiler/IR2/AtomicOp.cpp

@@ -1842,4 +1842,44 @@ RegisterAccess StackSpillLoadOp::get_set_destination() const {
   throw std::runtime_error("StackSpillLoadOp cannot be treated as a set! operation");
 }
 
+bool is_op_2(AtomicOp* op,
+             MatchParam<SimpleExpression::Kind> kind,
+             MatchParam<Register> dst,
+             MatchParam<Register> src0,
+             Register* dst_out,
+             Register* src0_out) {
+  // should be a set reg to int math 2 ir
+  auto set = dynamic_cast<SetVarOp*>(op);
+  if (!set) {
+    return false;
+  }
+
+  // destination should be a register
+  auto dest = set->dst();
+  if (dst != dest.reg()) {
+    return false;
+  }
+
+  auto math = set->src();
+  if (kind != math.kind()) {
+    return false;
+  }
+
+  auto arg = math.get_arg(0);
+
+  if (!arg.is_var() || src0 != arg.var().reg()) {
+    return false;
+  }
+
+  // it's a match!
+  if (dst_out) {
+    *dst_out = dest.reg();
+  }
+
+  if (src0_out) {
+    *src0_out = arg.var().reg();
+  }
+
+  return true;
+}
 }  // namespace decompiler