Jakob Stoklund Olesen b16081ce8c Handle REG_SEQUENCE with implicitly defined operands. ...

Code like that would only be produced by bugpoint, but we should still
handle it correctly.

When a register is defined by a REG_SEQUENCE of undefs, the register
itself is undef. Previously, we would create a register with uses but no
defs.

Fixes part of PR10520.

llvm-svn: 136401

2011-07-28 21:38:51 +00:00

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