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When tablegen detects that there exist two subregister compositions that result in the same value for some register, it will emit a warning. This kind of an overlap in compositions should only happen when it is caused by a user-defined composition. It can happen, however, that the user- defined composition is not identically equal to another one, but it does produce the same value for one or more registers. In such cases suppress the warning. This patch is to silence the warning when building the System Z backend after D50725. Differential Revision: https://reviews.llvm.org/D50977 llvm-svn: 347894