[libc] Add support for FMA in the GPU utilities This adds the generic FMA utilities for the GPU. We implement these through the builtins which map to the FMA instructions in the ISA. These may not have strict compliance with other assumptions in the the `libc` such as rounding modes. I've included the relevant information on how the GPU vendors map the behaviour. This should help make it easier to implement some future generic versions. Depends on D152486 Reviewed By: lntue Differential Revision: https://reviews.llvm.org/D152923
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