Update LLVM to include 4 backported commits by @majnemer.

eddyb · eddyb · commit 34f856e905e9 · 2016-08-17T05:37:48.000+03:00
diff --git a/src/llvm b/src/llvm
@@ -1 +1 @@
-Subproject commit 786aad117be48547f4ca50fae84c4879fa992d4d
+Subproject commit c3eb3c7608f439231d0c1340af6b720f113b4bf4
diff --git a/src/rustllvm/llvm-auto-clean-trigger b/src/rustllvm/llvm-auto-clean-trigger
@@ -1,4 +1,4 @@
 # If this file is modified, then llvm will be forcibly cleaned and then rebuilt.
 # The actual contents of this file do not matter, but to trigger a change on the
 # build bots then the contents should be changed so git updates the mtime.
-2016-08-07
+2016-08-17
