[AArch64] Internal error 200108231 raised when making compiler with `-O3 -OoDEADSTORE`
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## Summary
When building the compiler with the options `OPTNEW="-O3 -OoDEADSTORE"`, the process fails at the start of the ppc1 stage with Internal error 200108231. This error is related to temprefs and may tie into the ongoing problems with inlining.
## System Information
<!-- The more information are provided the easier it is to replicate the bug -->
- **Operating system:** Linux (Raspberry Pi OS)
- **Processor architecture:** AArch64 (others currently untested)
- **Compiler version:** Trunk
- **Device:** Raspberry Pi
## Steps to reproduce
Simply try to build the trunk with `make clean all OPTNEW="-O3 -OoDEADSTORE"`.
## Relevant logs and/or screenshots
```
/home/pi/Documents/programming/fpc-opts/compiler/ppc1 -Ur -Ur -Xs -O2 -n -Fi../inc -Fi../aarch64 -Fi../unix -Fiaarch64 -FE. -FU/home/pi/Documents/programming/fpc-opts/rtl/units/aarch64-linux -Fl/usr/lib/gcc/aarch64-linux-gnu/14 -O3 -OoDEADSTORE -DD2026/03/30 -daarch64 -dRELEASE -Us -Sg system.pp
genmath.inc(871,17) Fatal: Internal error 200108231
Fatal: Compilation aborted
```
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