[Bug ld/27871] ld: Add -Bsymbolic-non-weak-functions which only applies to STB_GLOBAL STT_FUNC

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=27871

--- Comment #1 from Fangrui Song <i at maskray dot me> ---
ld patch: https://sourceware.org/pipermail/binutils/2021-May/116703.html
gold patch: https://sourceware.org/pipermail/binutils/2021-May/116683.html

(I was considering -Bsymbolic-global-functions but Peter Smith suggested that
"global" can confuse users. non-weak or non-vague is better. Detecting vague
properly requires detection of COMDAT, which would cause some complexity. I
feel that non-weak is better: this way we provide an escape hatch for users who
want definition interposition (very rare and good to have a way))

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