LLVM: Update submodule to include patches for MSP430.

vadzimdambrouski · vadzimdambrouski · commit 6c52c3fdaff5 · 2016-12-08T16:41:40.000+03:00
Fixes rust-lang#37829
diff --git a/src/llvm b/src/llvm
@@ -1 +1 @@
-Subproject commit 3ec14daffb4b8c0604df50b7fb0ab552f456e381
+Subproject commit d7342a9a957470bb62c890cf88fc655ccfb755cc
