Fix a segfault in ctfmerge due to a bug in gcc.
GCC can generate bogus dwarf attributes with DW_AT_byte_size set to 0xFFFFFFFF. The issue was originaly detected in NetBSD but it has been adapted for portability and to avoid compiler warnings.
Reference: https://www.illumos.org/issues/3776
Obtained from: NetBSD MFC after: 1 month
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