lit: warn when passed invalid pathname
lit: warn when passed invalid pathname

It would previously say things like

  warning: input 'test/Frontend/foo.c' contained no tests

and have the user pull their hair trying to figure out what's wrong with that
file. This patch changes the message to the much clearer:

  warning: no such file or directory: 'test/Frontend/foo.c'

Differential Revision: http://reviews.llvm.org/D4097

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@210597 91177308-0d34-0410-b5e6-96231b3b80d8

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