Remove hack now that stage0 doesn't use it.

Author: cixtor

src/rt/main.ll.in

@@ -16,8 +16,6 @@ declare i32 @rust_start(i32, i32, i32, i32)
 
 %task = type { i32, i32, i32, i32, i32, i32, i32, i32 }
 
-@_rust_fetch_this_object_hack = global i32 0
-
 define i32 @"MAIN"(i32, i32) {
   %3 = tail call i32 @rust_start(i32 ptrtoint (void (i1*, %task*, %2*, %5*)* @_rust_main to i32), i32 %0, i32 %1, i32 ptrtoint (%0* @_rust_crate_map_toplevel to i32))
   ret i32 %3