[patch] Delete Reloc::Default.

[Rafael Espíndola via llvm-commits]

Having an enum member named Default is quite confusing: Is it distinct
from the others?

This patch removes that member and instead uses Optional<Reloc> in
places where we have a user input that still hasn't been maped to the
default value, which is now clear has no be one of the remaining 3
options.

Cheers,
Rafael
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