[llvm] [PowerPC] fix bug affecting float to int32 conversion on LE PowerPC (PR #150194)

[via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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DanilaZhebryakov wrote:

dropped. (this file was made by editing an autogenerated one, forgot to drop the line)

https://github.com/llvm/llvm-project/pull/150194