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GHC's runtime linker only checks the Thumb bit (bit 0) for ELF symbols with type STT_FUNC. Imported symbols (e.g. glibc's strlen resolved via dlsym) have type STT_NOTYPE, so the check is skipped. This causes the linker to emit ARM BL instead of BLX for ARM→Thumb calls, resulting in SIGILL when Template Haskell evaluation triggers calls to Thumb glibc functions under QEMU. The patch adds a fallback that detects the Thumb bit from the resolved address itself, which dlsym preserves on ARM32 Linux. Also pin nixpkgs to nixos-25.05 (GHC 9.8.4) to avoid an LLVM ARM32 crash affecting GHC 9.10+ with all LLVM 17–21. Add core dump files to .gitignore
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This closes #738