Follow-up Comment #1, bug #26284 (project avr-libc):
This actually may have been like for a long time, but I think it should still
be changed. As is, the macro is a hassle to use since it doesn't accept a
variable; it must be hard-coded in a switch statement or something. Also, the
very similar 'boot_signature_byte_get' isn't limited to constants. My patch
makes 'boot_lock_fuse_bits_get' more flexible like 'boot_signature_byte_get'.
Also there is no need to explicitly mark r0, r31, r30 as clobbered. r0 is not
changed by LPM, only by SPM
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