JIT: drop `-fno-plt` on Linux x86-64

[diegorusso]

Feature or enhancement

Proposal:

#148238 removes -fno-plt for Linux AArch64. The JIT code generated has improved.

We should do a similar thing for Linux x86-64. I tried on that PR but the change requires more investigation.

Has this already been discussed elsewhere?

I have already discussed this feature proposal on Discourse

Links to previous discussion of this feature:

I've discussed this with @markshannon