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[Bug c/19924] New: [AVR] MODES_TIEABLE incorrect

MODES_TIEABLE in avr is set such that access to subreg is prevented.

This result is significantly sub-optimal code.

Attached patch changes this. No regressions have been found with test suite -
indeed things got better!

Note this is related to PR/19815 documentation error.

-- 
           Summary: [AVR] MODES_TIEABLE incorrect
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: andrewhutchinson at cox dot net
                CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: avr


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19924
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