[llvm] [llubi] Initial support for floating-point numbers (PR #188453)

[Zhige Chen via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llubi_test_checks.py UTC_ARGS: --version 6
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nofe1248 wrote:

This test was added because this PR also changes the non-determinism switches. If needed I can split this test into another PR.

https://github.com/llvm/llvm-project/pull/188453