[gold] PowerPC PLT

[David Edelsohn]

Attached is a starting point for 32-bit PowerPC Linux ABI secure-plt
PLT support.
The attached patch is broken in many ways and I primarily want to use it
as a strawman to understand gold internals better and figure out how to
implement the necessary functionality for the PowerPC ABI.

The revised 32-bit PowerPC Linux ABI allows the GOT to be non-executable.
The new PLT is composed of three parts: an array of function pointers, call
stubs that load the addresses, and code supporting dynamic linking (glink).
I am trying to understand how to map this to gold.

Does Output_data_space and add_output_section_data create a new section
or create a new view within a section?

Can Output_data_plt_powerpc::do_write()  use the different spaces to materialize
all three pieces of the new PLT with a single iteration through the
PLT entires or
should the PLT be a single, undifferentiated blob that do_write()
iterates through --
appending the different pieces manually with three, separate loops over the PLT
entries?

Thanks, David
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