Un-XFAIL a few recently passing tests.

src/test/run-pass/expr-if-generic-box2.rs

@@ -1,5 +1,4 @@
 // xfail-boot
-// xfail-stage0
 // -*- rust -*-
 
 type compare[T] = fn(&T t1, &T t2) -> bool;

src/test/run-pass/generic-alias-box.rs

@@ -1,5 +1,4 @@
 // xfail-boot
-// xfail-stage0
 
 fn id[T](&T t) -> T {
   ret t;

src/test/run-pass/generic-temporary.rs

@@ -1,6 +1,4 @@
 
-// xfail-stage0
-
 fn mk() -> int {
   ret 1;
 }

src/test/run-pass/size-and-align.rs

@@ -1,4 +1,3 @@
-// xfail-stage0
 // -*- rust -*-
 
 tag clam[T] {

src/test/run-pass/typestate-cfg-nesting.rs

@@ -1,5 +1,3 @@
-// xfail-stage0
-
 fn f() {
 
   auto x = 10;

src/test/run-pass/while-with-break.rs

@@ -1,4 +1,3 @@
-// xfail-stage0
 // -*- rust -*-
 
 fn main() {