Remove accidental duplications in lnt usage messages. 

Usage: lnt lnt runtest nt

Changed to:

Usage: lnt runtest nt


git-svn-id: https://llvm.org/svn/llvm-project/lnt/trunk@188104 91177308-0d34-0410-b5e6-96231b3b80d8
Add a second attribute to each point: the time and date for that sample's run. Display that in the graph view mouse over.


git-svn-id: https://llvm.org/svn/llvm-project/lnt/trunk@188111 91177308-0d34-0410-b5e6-96231b3b80d8