Fix directive parsing in VerifyDiagnosticConsumer so that it ensures that "expected" is at the start of the word and will no longer accept typos such as "junkexpected-*" as a valid "expected-*" directive.  A very few test-cases had to be amended to adhere to the new rule.

Patch reviewed by David Blaikie.

llvm-svn: 166279
6 files changed