Merge pull request #13744 from Vexu/stage2-fixes

Improve error messages, fix dependency loops

test/cases/compile_errors/missing_parameter_name.zig

@@ -0,0 +1,19 @@
+fn f2(u64) u64 {
+    return x;
+}
+fn f3(*x) u64 {
+    return x;
+}
+fn f1(x) u64 {
+    return x;
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :1:7: error: missing parameter name
+// :4:7: error: missing parameter name
+// :7:7: error: missing parameter name or type
+// :7:7: note: if this is a name, annotate its type 'x: T'
+// :7:7: note: if this is a type, give it a name '<name>: x'