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G_ANYEXT can be introduced by the legalizer when widening scalars. Add support for it in the register bank info (same mapping as everything else) and in the instruction selector. When selecting it, we treat it as a COPY, just like G_TRUNC. On this occasion we get rid of some assertions in selectCopy so we can reuse it. This shouldn't be a problem at the moment since we're not supporting any complicated cases (e.g. FPR, different register banks). We might want to separate the paths when we do. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302778 91177308-0d34-0410-b5e6-96231b3b80d8