[avr-libc-dev] [bug #21623] boot.h: Use the "z" register constraint

[Eric Weddington]

Update of bug #21623 (project avr-libc):

             Assigned to:                    None => arcanum                

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Follow-up Comment #1:

I have some concerns:
- Even though you replace the constraint with the Z constraint, you are
removing r30, r31 from the clobbered list. Should this be done?
- Right now there is a major AVR GCC bug with the EEPROM API because it uses
the Z register instead of a general purpose reg and the compiler can't find a
register to use.

I would prefer if this change got a lot of testing before it gets committed.

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