illumos gate

# powertop -t1
Segmentation Fault (core dumped)

This used to work previously. The analysis from Richard Lowe:
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We used to treat optarg as common via a copy relocation (ie, we'd copy
the contents into the executable at link-edit, then relocate everyone to
use our copy). Now we shadow. (You can confirm this via elfdump -y,
the 'C' flag)

This is because when libc is built by studio, optarg lands in .data,
initialized to "\0", so we move it to the executable common, and set up
a copy relocation to copy the initialized data at runtime, and then
relocate all references (including libc), to this copy in our bss.

When libc is built by gcc, optarg lands in .bss (automatically
initialized), none of this happens. The version in the executable
shadows the one in libc.

We decide how to do this at link-edit time. What matters is not the
libc we bind at runtime, but the libc that the link-editor sees at that
time. (ie, in this case, the one in 134, with optarg in .data)
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