solve "duplicate :raise event" in require too [Bug #15877]

load.c

@@ -1053,7 +1053,6 @@ rb_require_safe(VALUE fname, int safe)
     int result = rb_require_internal(fname, safe);
 
     if (result > TAG_RETURN) {
-	if (result == TAG_RAISE) rb_exc_raise(rb_errinfo());
 	EC_JUMP_TAG(GET_EC(), result);
     }
     if (result < 0) {

test/ruby/test_settracefunc.rb

@@ -1676,10 +1676,16 @@ class TestSetTraceFunc < Test::Unit::TestCase
     tmpdir = Dir.mktmpdir
     path = "#{tmpdir}/hola.rb"
     File.open(path, "w") { |f| f.write("raise") }
-    TracePoint.new(:raise){|tp| next if !target_thread?; events << [tp.event]}.enable{
+    tp = TracePoint.new(:raise) {|tp| events << [tp.event] if target_thread?}
+    tp.enable{
       load path rescue nil
     }
     assert_equal [[:raise]], events
+    events.clear
+    tp.enable{
+      require path rescue nil
+    }
+    assert_equal [[:raise]], events
   ensure
     FileUtils.rmtree(tmpdir)
   end