move passing stage1 compile error tests to stage2

test/cases/compile_errors/parameter_redeclaration.zig

@@ -0,0 +1,10 @@
+fn f(a : i32, a : i32) void {
+}
+export fn entry() void { f(1, 2); }
+
+// error
+// backend=stage2
+// target=native
+//
+// :1:15: error: redeclaration of function parameter 'a'
+// :1:6: note: previous declaration here