[gold commit] PR 22915: Add x86-64 support for Indirect Branch Tracking (IBT)

[Cary Coutant]

This patch adds x86-64 support for IBT.

-cary


2018-06-23  Cary Coutant  <ccoutant@gmail.com>

gold/
        PR gold/22915
        * x86_64.cc (Output_data_plt_x86_64_ibt): New class.
        (Target_x86_64::do_make_data_plt): (All instantiations) Check for
        IBT feature bit and create IBT PLTs.
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