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A register operand that has a common sub-class with its instruction's defined register class is not always legal. For example, SReg_32 and M0Reg both have a common sub-class, but we can't use an SReg_32 in instructions that expect a M0Reg. This prevents the llvm.SI.sendmsg.ll test from failing when the fold operand pass is added. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222368 91177308-0d34-0410-b5e6-96231b3b80d8
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