Update to the latest llvm/clang/lld

This version of llvm has got working SjLj exception handling
on x86, x86_64 and arm.

Dockerfile

@@ -24,14 +24,14 @@ RUN git clone -b master https://github.com/llvm-mirror/llvm.git && \
     git svn init https://llvm.org/svn/llvm-project/llvm/trunk && \
     git config svn-remote.svn.fetch :refs/remotes/origin/master && \
     git svn rebase -l && \
-    git checkout 3254c743c87df0aefff33424852df5ca3fbda277 && \
+    git checkout 0df2d3e4b69ffba332ca9af832a65c12938e3fb9 && \
     cd tools/clang && \
     git svn init https://llvm.org/svn/llvm-project/cfe/trunk && \
     git config svn-remote.svn.fetch :refs/remotes/origin/master && \
     git svn rebase -l && \
-    git checkout 420a3ebdcee02758222bc4a11351e3a4083e6922 && \
+    git checkout eb5cf2772e69d4a06981255554b7de2002974707 && \
     cd ../lld && \
-    git checkout a1d06e7cbe1fcb2370fef00d4cc9f367d4b577cc
+    git checkout a07c9a298eb1edc5d4f7e5a7265387d88d87ef87
 
 
 RUN mkdir /build/prefix