[llvm] Delete the incorrect assert that assumes size of `APFloat` is the same as `IEEEFloat`. (PR #111780)

[Daniel Chen via llvm-commits]

DanielCChen wrote:

> This assertion is to make sure that EBO is performed on APFloat. What is the compiler you use to build llvm?
We are building it on Linux on Power and AIX. This code broke our downstream code we have inside of APFloat that are not IEEE.


https://github.com/llvm/llvm-project/pull/111780