Binary operations from stack

src/converter_test.zig

@@ -130,3 +130,11 @@ test "constant_xor" {
 test "minimal_stack" {
     try invsrc(@src());
 }
+
+test "stack_add" {
+    try invsrc(@src());
+}
+
+test "stack_sub" {
+    try invsrc(@src());
+}

tests/stack_add.bbb

@@ -0,0 +1,6 @@
+[export] main = fn [cc(c)] () s32
+{
+    >a: s32 = -1;
+    >b: s32 = 1;
+    return a + b;
+}

tests/stack_sub.bbb

@@ -0,0 +1,6 @@
+[export] main = fn [cc(c)] () s32
+{
+    >a: s32 = 1;
+    >b: s32 = 1;
+    return a - b;
+}