[x86-64 psABI] Document STT_GNU_IFUNC and R_X86_64_IRELATIVE

[H.J. Lu]

Hi,

This patch for x86-64 psABI adds document for STT_GNU_IFUNC and
R_X86_64_IRELATIVE. It has been implemented on Linux/x86-64 for
more than a year.  Please add it to x86-64 psABI.

Thanks.

-- 
H.J.
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