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Back in RISCOS_Lib 5.35, a bug was introduced in ErrorHandler where it
would try saving the registers to a garbage address for SCL builds where
SASTMhatbroken is false. This bug has gone unnoticed until now because
up until a few months ago, SASTMhatbroken was always true (commit
3b7d39bd in RISCOS_Lib 6.13).

Move the offending line of code out of the SASTMhatbroken block so that
register capturing will work correctly for all build configs.

Fixes issue reported on the forums (tested with a ROM build on Pi 4):
https://www.riscosopen.org/forum/forums/4/topics/17647

Version 6.16. Tagged as 'RISC_OSLib-6_16'