Reland "Do not create LLVM IR `constant`s for objects with dynamic initialisation"

This relands commit 13dd65b3.

The original commit contained a test, which failed when compiled
for a MACH-O target.

This patch changes the test to run for x86_64-linux instead of
`%itanium_abi_triple`, to avoid having invalid syntax for MACH-O
sections. The patch itself does not care about section attribute
syntax and a x86 backend does not even need to be included in the
build.

Differential Revision: https://reviews.llvm.org/D102693