[ARM] Use t2LDRLIT_ga_pcrel for loading stack guards with no-movt in PIC mode. (#156208)
When using no-movt we don't use the pcrel version of the literal load.
This change also unifies logic with the ARM version of this function as
well,
which has:
```
if (!Subtarget.useMovt() || ForceELFGOTPIC) {
// For ELF non-PIC, use GOT PIC code sequence as well because R_ARM_GOT_ABS
// does not have assembler support.
if (TM.isPositionIndependent() || ForceELFGOTPIC)
expandLoadStackGuardBase(MI, ARM::LDRLIT_ga_pcrel, ARM::LDRi12);
else
expandLoadStackGuardBase(MI, ARM::LDRLIT_ga_abs, ARM::LDRi12);
return;
}
```
rdar://138334512
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