[clang] [llvm] [X86] Fix x87 excess precision escaping into f32/f64 values (PR #215104)

[Dennis Duda via cfe-commits]

seritools wrote:

> Please reply to this message to confirm that you have read these policies, especially the LLVM AI Tool Use Policy, and that any AI tool usage has been noted in the PR description.

I have read them. There is a big expander block explaining my process with Claude at the top.

https://github.com/llvm/llvm-project/pull/215104