Jakob Stoklund Olesen e8838d5c5f Improve sub-register def handling in ProcessImplicitDefs.
This boils down to using MachineOperand::readsReg() more.

This fixes PR11829 where a use ended up after the first def when
lowering REG_SEQUENCE instructions involving IMPLICIT_DEFs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148996 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-25 23:36:27 +00:00
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