Minor bug fix. LowerSubregs should translate  %S0<def> = EXTRACT_SUBREG %Q0<kill>, 1 to %S0<def> = IMPLICIT_DEF %Q0<imp-use,kill>
Minor bug fix. LowerSubregs should translate 
%S0<def> = EXTRACT_SUBREG %Q0<kill>, 1
to
%S0<def> = IMPLICIT_DEF %Q0<imp-use,kill>

Implicit_def does not *read* any register so the operand should be marked "implicit". The missing "implicit" marker on the operand is wrong, but it doesn't actually break anything.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@82503 91177308-0d34-0410-b5e6-96231b3b80d8

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