Nico Weber ca27a2b037 Validate -add-plugin arguments.
-plugin already prints an error if the name of an unknown plugin is passed.
-add-plugin used to silently ignore that, now it errors too.

Differential Revision: https://reviews.llvm.org/D56273

llvm-svn: 350340
2019-01-03 18:26:06 +00:00
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