Update to the latest versions of llvm/clang/lld

This includes support for a -fdwarf-exceptions flag in clang,
allowing to choose that exception handling model on architectures
where it isn't the default.

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 305f0fb15600a5e4a247a8bcf230d4fbf56ac6ba && \
+    git checkout 685c102164544ca0d08ac37f049fef441ab64d07 && \
     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 fb2fbcc95291e95c593f9e5d5712a3fdd82c186a && \
+    git checkout 2e029fd699d0f2a0dfa93e80929b06d0cd0a8b3b && \
     cd ../lld && \
-    git checkout bdb0db17cbabf8ad325ed3cd21054aec17056680
+    git checkout 8fdb9a250383356b085a2d783a87e7ea6b96b6e3
 
 
 # Build LLVM