auto merge of #9665 : alexcrichton/rust/snapshot, r=brson

Uses the new snapshots to kill the old `loop` and introduce the new `continue`.

src/libstd/num/strconv.rs

@@ -354,7 +354,7 @@ pub fn float_to_str_bytes_common<T:NumCast+Zero+One+Eq+Ord+Float+Round+
                     }
 
                     // Skip the '.'
-                    if buf[i] == '.' as u8 { i -= 1; loop; }
+                    if buf[i] == '.' as u8 { i -= 1; continue; }
 
                     // Either increment the digit,
                     // or set to 0 if max and carry the 1.