[patch,avr] PR31687

[Georg-Johann Lay]

AVR: binutils/31687 - Include .rodata size in avr-objdump -P mem-usage.

AVR emulations with a .rodata output section were missing the
size of that section in  avr-objdump -P mem-usage.  These are
the emulations that keep .rodata in program memory, which can
be supported by devices that see (a part of) the program memory
in the RAM address space.

The patch also introduces a code clean-up related to PR 27283,
which was about broken binaries that lead to overflow / UB in
size computation.  The section size is now just truncated or
saturated, alongside with a diagnostic about the truncation and
*which* section length is being truncated.

binutils/
         PR binutils/31687
         * od-elf32_avr.c (elf32_avr_get_truncated_size): New static 
function.
         (elf32_avr_get_memory_usage): Use it to get (truncated) section 
sizes.
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