[llvm] [MIPS] Fix -msingle-float doesn't work with double on O32 (PR #107543)

[YunQiang Su via llvm-commits]

wzssyqa wrote:

No. This problem is about clang not llc.
The `llvm/test/CodeGen/Mips/2008-07-06-fadd64.ll` is already OK.
Please see the bug report.


https://github.com/llvm/llvm-project/pull/107543