Jakob Stoklund Olesen 4bfc6fba78 Downgrade a tablegen warning to an error.
Ambiguous sub-register index compositions are OK as long as the backend writer
knows what he is doing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131134 91177308-0d34-0410-b5e6-96231b3b80d8
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