move passing stage1 compile error tests to stage2

test/cases/compile_errors/local_variable_redeclaration.zig

@@ -0,0 +1,11 @@
+export fn f() void {
+    const a : i32 = 0;
+    var a = 0;
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :3:9: error: redeclaration of local constant 'a'
+// :2:11: note: previous declaration here