[roll] Roll llvm-project/libc [libc][math] Adds entrypoint and tests for nearbyintf128,scalbnf128 (#88443)

Closes #84689.

Adding @lntue for review.

I was curious about the implementation of
`round_using_current_rounding_mode` used for the `nearbyint` functions.
It has one of the rounding modes as unreachable
([here](https://github.com/llvm/llvm-project/blob/main/libc/src/__support/FPUtil/NearestIntegerOperations.h#L243)),
and I was wondering if this was okay for the `nearbyint` functions.

---------

Co-authored-by: Michael Flanders <mkf727@cs.washington.edu>
GitOrigin-RevId: b9e64ef67f98ed618709daf7eb3732c4f72a1aa2
Original-Revision: 432dc9f29f3b77fef4b441035bbf099cc8086d6f
Change-Id: Id6d7542dbdeb1024f03830a743dca6c67bb45deb
1 file changed
tree: 829e983afeae226b46080b95a59fa0ae855a019a
  1. ctf/
  2. git-hooks/
  3. infra/
  4. third_party/
  5. cts
  6. firmware
  7. flower
  8. jiri.lock
  9. MILESTONE
  10. minimal
  11. prebuilts
  12. README.md
  13. stem
  14. test_durations
  15. toolchain
README.md

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