[llvm] [AArch64] Lower extending sitofp using tbl (PR #92528)

[Momchil Velikov via llvm-commits]

momchil-velikov wrote:

Should be OK to re-commit after https://github.com/llvm/llvm-project/pull/97448
I ran Eigen tests, they look good (well, I get random distinct 0-3 failures on each run, which happens on `main` too).
Will re-commit next week, unless somebody spots a problem.

https://github.com/llvm/llvm-project/pull/92528