auto merge of #12462 : kballard/rust/restore-llvm-from-12407, r=brson

bors · bors · commit d22099ca44bc · 2014-02-22T01:11:50.000-08:00
PR #12407 was accidentally reverted by PR #12411. Restore the correct version of LLVM that PR #12407 introduced.
diff --git a/src/llvm b/src/llvm
@@ -1 +1 @@
-Subproject commit f5f1ffea207b6b380127ff34f14015ae005d1413
+Subproject commit b015ecddd3129490fa26e5278a1acee79f2ee5ef
