move passing stage1 compile error tests to stage2

test/cases/compile_errors/duplicate_boolean_switch_value.zig

@@ -0,0 +1,23 @@
+comptime {
+    const x = switch (true) {
+        true => false,
+        false => true,
+        true => false,
+    };
+    _ = x;
+}
+comptime {
+    const x = switch (true) {
+        false => true,
+        true => false,
+        false => true,
+    };
+    _ = x;
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :5:9: error: duplicate switch value
+// :13:9: error: duplicate switch value