[llvm] [X86][GlobalISel] Support G_FADD, G_FSUB, G_FMUL, G_FDIV (PR #87339)

[Evgenii Kudriashov via llvm-commits]

e-kud wrote:

Generally it is needed to test `G_STORE` and `G_LOAD` as existing tests use `fadd` to enforce `float` vector type. 


https://github.com/llvm/llvm-project/pull/87339