Ryan Houdek abb8de0966 VDSO: Add sigreturn functions to VDSO
These need to be bit-exact following exactly what is shown in the
assembly.

libunwind parses where EIP is to see if it is in a stack frame.
Also needsto live in VDSO otherwise backtrace doesn't work.
2023-02-04 10:35:06 -08:00
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