rustc: Update LLVM to the LLVM 3.9 release branch

alexcrichton · badboy · commit 75bcda4cf1c2 · 2016-07-29T10:29:59.000+02:00
The 3.9 release of LLVM isn't out yet, but this moves us onto that branch to
start tracking it.
diff --git a/src/llvm b/src/llvm
@@ -1 +1 @@
-Subproject commit fb2893b136c6a83a6f34f708fac2530d95e2db65
+Subproject commit 6879bb3b6ac975987250b10314e7e4069846e8c1
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.
-2016-07-20
+2016-07-25b
