[release/9.0-rc1] Revert "Use Unsafe.BitCast
for Int128
↔UInt128
operators"
#106431
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Backport of #106430 to release/9.0-rc1
/cc @stephentoub
Customer Impact
[Select one or both of the boxes. Describe how this issue impacts customers, citing the expected and actual behaviors and scope of the issue. If customer-reported, provide the issue number.]
Regression
Automated revert of #104506, which triggered some performance regression test failures.
Testing
CI
Risk
Low. This just reverts a small cleanup PR that ended up regressing some perf tests.