Summarization of LLVM-Cov and Multiple files

[Ruskiewicz, Joseph via llvm-commits]

Hello all,
	I had a situation recently where I wanted to have llvm-cov report only one report for multiple files.  If we pass in no source files, we get a nice summary report of the project and if we pass in files we get separate reports for each file (functional coverage).  I have created a patch that allows the user to pass in a flag -summarize that allows the user to pass in multiple files, but gets the summary of the current report for no source files.

	Please see attached.  It was really unclear how to get a test to dance on this one, so I am sure that I will get some feedback! ;)

Thanks for the amazing runtime and compiler!
Joseph
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