[llvm] [PowerPC] Respect endianness when bitcasting to fp128 (PR #95931)

[Chen Zheng via llvm-commits]

chenzheng1030 wrote:

> If this fix is accepted, could it be considered for 18.x?

https://discourse.llvm.org/t/18-1-8-released/79725

"There are no more planned 18.1.x releases, but there could be one if a critical issue is found. The release/19.x branch will be created on July 23, 2024."

https://github.com/llvm/llvm-project/pull/95931