auto merge of #17812 : thestinger/rust/jemalloc, r=alexcrichton

bors · bors · commit 7ce1a17caddb · 2014-10-06T11:17:16.000Z
This includes optimizations to the thread cache and support for
shrinking and expanding huge (&gt;4M) allocations in-place.
diff --git a/src/jemalloc b/src/jemalloc
@@ -1 +1 @@
-Subproject commit 2dba541881fb8e35246d653bbe2e7c7088777a4a
+Subproject commit b001609960ca33047e5cbc5a231c1e24b6041d4b
