[BOLT] Always move JTs in jump-table=move

We should always move jump tables when requested. Previously,
we were not moving jump tables of non-simple functions in relocation
mode. That caused a bug detailed in the attached test case: in PIC
jump tables, we force jump tables to be moved, but if they are not
moved because the function is not simple, we could incorrectly update
original entries in .rodata, corrupting it under special circumstances
(see testcase).

Reviewed By: #bolt, maksfb

Differential Revision: https://reviews.llvm.org/D137357