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i#5705: Add handling of written SP in rseq regions

Merged Derek Bruening requested to merge i5705-rseq-sp into master

If SP is written inside an rseq region, DR was trying to save and restore it like a regular GPR, which fails. We have to go through a scratch register.

Adds a test that reproduces an encoding failure with this fix.

Fixes #5705 (closed)