[Bug libdw/26773] sleb128 values near INT64_MAX/MIN not correctly read

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26773

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
I looked at this a little today.

In addition to this bug, I think the _unchecked variants
have another bug; namely they do:

  const size_t max = len_leb128 (int64_t) - 1;

This limits the number of bytes read-- but it seems like
it maybe ought to read until the first byte without the
high bit set.

FWIW gdb seems to rely on implementation-defined behavior
here.  It does all the sleb work in an unsigned type
and then casts it to signed on return.

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