[roll] Roll llvm-project/libc [libc][math] Refactor exp2 implementation to header-only in src/__support/math folder. (#161297)

Part of #147386

in preparation for: https://discourse.llvm.org/t/rfc-make-clang-builtin-math-functions-constexpr-with-llvm-libc-to-support-c-23-constexpr-math-functions/86450

GitOrigin-RevId: 3e78c313bcfa54f8d1f1bdf221611d461e56111c
Original-Revision: b6f04bd2244b0c0e711e2d203f857a11a2badee3

Rolled-Repo: https://llvm.googlesource.com/llvm-project/libc
Rolled-Commits: 8a55b3b9df92f2..b6f04bd2244b0c
Roller-URL: https://cr-buildbucket.appspot.com/build/8701882568772024769
CQ-Do-Not-Cancel-Tryjobs: true
Cq-Include-Trybots: luci.turquoise.global.try:run-postsubmit-tryjobs
Change-Id: I3f85377825bbd49f3b991112f07a8ec855f321ed
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1384067
Commit-Queue: GI Roller <global-integration-roller@fuchsia-infra.iam.gserviceaccount.com>
2 files changed