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* [hlsl-out] Write `mad` intrinsic for `fma` function - This should be enough because we only support f32 for now. - Adds a new test for WGSL functions, in the spirit of operators.wgsl. - Closes #1579 * Add FMA feature to glsl backend - I think this is right. Just iterate all known expressions in all functions and entry points to locate any `fma` function call. Should not need to walk the statement DAG. * Transform GLSL fma function into an airthmetic expression when necessary * Add tests for GLSL fma function tranformation * Remove the hazard comment from the webgl test input * Add helper method for fma function support checks * Address review comment
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