travis: Switch to Ubuntu 16.04 (xenial)
Use native packages up to llvm-6.
Reviewer: tstellar
Signed-off-by: 
Jan Vesely <jan.vesely@rutgers.edu>
llvm-svn: 373046
parent
40d4b533
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Use native packages up to llvm-6.
Reviewer: tstellar
Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
llvm-svn: 373046