Add missing EOL. NFCI.
[FileCheck] Report missing prefixes when more than one is provided.If more than a prefix is provided - e.g. --check-prefixes=CHECK,FOO - wedon't report if (say) FOO is never used. This may lead to
[FileCheck] Report missing prefixes when more than one is provided.If more than a prefix is provided - e.g. --check-prefixes=CHECK,FOO - wedon't report if (say) FOO is never used. This may lead to a gap in ourtest coverage.This patch introduces a new option, --allow-unused-prefixes. Itcurrently is set to true, keeping today's behavior. After we explicitlyset it in tests where this behavior was actually intentional, we willswitch it to false by default.Differential Revision: https://reviews.llvm.org/D90281
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