Un-xfail various tests

Author: brson

src/test/bench/shootout-nbody.rs

@@ -1,4 +1,3 @@
-// xfail-test
 // based on:
 // http://shootout.alioth.debian.org/u32/benchmark.php?test=nbody&lang=java
 

src/test/run-fail/spawnfail.rs

@@ -1,5 +1,4 @@
 // Currently failure doesn't propagate correctly to owning tasks so xfailed
-// xfail-test
 // error-pattern:explicit
 use std;
 import std::task;

src/test/run-pass/bind-native.rs

@@ -2,8 +2,6 @@
 Can we bind native things?
 */
 
-//xfail-test
-
 native "rust" mod rustrt {
     fn task_yield();
 }

src/test/run-pass/block-expr-precedence.rs

@@ -2,7 +2,6 @@
 // reproduce so we don't want to automatically reformat it
 
 // no-reformat
-// xfail-pretty
 
 /*
  *

src/test/run-pass/first-class-method.rs

@@ -1,5 +1,3 @@
-// xfail-test
-
 // Test case for issue #758.
 obj foo() { fn f() { } }
 

src/test/run-pass/log-linearized.rs

@@ -1,5 +1,3 @@
-// xfail-test
-
 // Tests that shapes respect linearize_ty_params().
 
 tag option<T> {