tests: move compile errors not planned for stage2

src/Sema.zig

@@ -13203,7 +13203,6 @@ fn zirCondbr(
     defer tracy.end();
 
     const inst_data = sema.code.instructions.items(.data)[inst].pl_node;
-    const src = inst_data.src();
     const cond_src: LazySrcLoc = .{ .node_offset_if_cond = inst_data.src_node };
     const extra = sema.code.extraData(Zir.Inst.CondBr, inst_data.payload_index);
 
@@ -13213,7 +13212,7 @@ fn zirCondbr(
     const uncasted_cond = try sema.resolveInst(extra.data.condition);
     const cond = try sema.coerce(parent_block, Type.bool, uncasted_cond, cond_src);
 
-    if (try sema.resolveDefinedValue(parent_block, src, cond)) |cond_val| {
+    if (try sema.resolveDefinedValue(parent_block, cond_src, cond)) |cond_val| {
         const body = if (cond_val.toBool()) then_body else else_body;
         // We use `analyzeBodyInner` since we want to propagate any possible
         // `error.ComptimeBreak` to the caller.

test/cases/compile_errors/comparing_against_undefined_produces_undefined_value.zig

@@ -0,0 +1,9 @@
+export fn entry() void {
+    if (2 == undefined) {}
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :2:11: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/obj/comparing_against_undefined_produces_undefined_value.zig

@@ -1,9 +0,0 @@
-export fn entry() void {
-    if (2 == undefined) {}
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:2:11: error: use of undefined value here causes undefined behavior