[patch] Fix BZ 20419 -- stack overflow with huge PT_NOTE segment

[Paul Pluzhnikov]

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> 2018-04-23  Paul Pluzhnikov  <ppluzhnikov@google.com>

>              [BZ #20419]
>              * elf/dl-load.c (open_verify): Fix stack overflow.
>              * elf/Makefile (tst-big-note): New test.
>              * elf/tst-big-note-lib.S: New.
>              * elf/tst-big-note.c: New.

-- 
Paul Pluzhnikov