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

[Subash B via llvm-commits]

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SubashBoopathi wrote:

@s-perron  , I have an alternative approach for implementing support for the constrained fmuladd intrinsic in the SPIR-V backend. Would it be better to raise this as a separate PR, or should I incorporate it into the current one?

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