[X86][GlobalISel] Enable G_SDIV/G_UDIV/G_SREM/G_UREM (#81615)

* Create a libcall for s64 type for 32 bit targets.
* Fix a bug in REM selection: SUBREG_TO_REG is not intended to produce a
value from super registers.
* Replace selector tests by end-to-end tests. Other passes
check the selected MIR better.