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When widening an existing <def,reads-undef> operand to a super-register, it may be necessary to clear the <undef> flag because the wider register is now read-modify-write through the instruction. Conversely, it may be necessary to add an <undef> flag when the coalescer turns a full-register def into a sub-register def, but the larger register wasn't live before the instruction. This happens in test/CodeGen/ARM/coalesce-subregs.ll, but the test is too small for the <undef> flags to affect the generated code. llvm-svn: 156951
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