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

[Shu-Chun Weng via llvm-commits]

scweng wrote:

Hi, at Google we are currently seeing two test failures after this commit:

1. In Jax, [lax_numpy_test](https://github.com/google/jax/blob/main/tests/lax_numpy_test.py) has some floating point number differences like -0.75 vs -0.6875 and 0.5 vs 0.6875.
2. In an internal test case for Eigen3, -4.22987 vs -5.

We are still trying to reduce the Eigen3 test, which is pure C++. I know that this change was landed over a week ago, but with the two differences both point to this commit, is it possible to roll it back until further investigation?

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