[ARM] Reset speculation-hardening-sls.ll test checks.

The commit e497b12a went and regenerated
all the checks lines in the Arm speculation-hardening-sls.ll test in a
way that removed most of the important checks. This just resets them
back to how they were before, with the single character fix to change:
; NOHARDENARM:     {{bxge lr$}}
to
; NOHARDENARM:     {{bxgt lr$}}

Differential Revision: https://reviews.llvm.org/D111074