Fixes member visibility for anonymous bitstruct. Bitstruct member attributes works. Anonymous bitstruct assignment fixed.

test/test_suite/bitstruct/anon_bitstruct_name_overlap.c3

@@ -0,0 +1,24 @@
+import std::io;
+
+struct Test {
+ushort a;
+  bitstruct : ushort @overlap {
+    ushort ab : 0..15;
+    char a : 8..15; // #error: Duplicate member name 'a'
+    char b : 0..7;
+    bool c : 7;
+    bool d : 6;
+    bool e : 5;
+    bool f : 4;
+  }
+}
+
+fn void main() {
+  io::printfn("Weird structs :P");
+
+  Test test;
+  test.ab = 0xAFBA;
+
+  io::printfn("%02x %02x -> %04x\n", test.a, test.b, test.ab);
+  io::printfn("%x %x %x %x\n", test.c, test.d, test.e, test.f);
+}