Add a check that objects obtained from the stack in
sub-access-debug-var-slot (x86) are valid. Debug variable locations are not always valid, and on the x86 there can be non-descriptor objects on the stack. Cleanup the sap-ref code in sub-access-debug-var-slot and sub-set-debug-var-slot which had been using convoluted code to work around sap-ref bugs that have since been fixed.
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