[llvm] [SPIRV] Added support for the constrained arithmetic intrinsic (PR #157441)

[Steven Perron via llvm-commits]

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s-perron wrote:

If the G_STRICT_FMAD is applied to a float or vector of floats, it will not be lowered. Is that what you want?

If you want it lowered all of the time, remove this line. I expect that is what you want based on earlier PRs.

https://github.com/llvm/llvm-project/pull/157441