auto merge of #5458 : pcwalton/rust/valgrind-suppress, r=pcwalton

Author: bors

src/etc/x86.supp

@@ -451,6 +451,21 @@
    fun:*uv_loop_delete*
 }
 
+{
+   race-or-something-ask-pcwalton-0
+   Memcheck:Value4
+   fun:*task_start_wrapper*
+   ...
+}
+
+{
+   race-or-something-ask-pcwalton-1
+   Memcheck:Value4
+   ...
+   fun:*build_start_wrapper*
+   ...
+}
+
 {
    lock_and_signal-probably-threadsafe-access-outside-of-lock
    Helgrind:Race