Deprecate --iree-codegen-gpu-native-math-precision
#20299
Merged
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This was mostly used on ROCm and WebGPU.
On ROCm, over the past month we have made this be essentially the default behavior, so the flag is essentially not needed anymore. The last thing required before we can drop usage of the flag on ROCm is #20074.
On WebGPU, this PR makes this be the default behavior like on ROCm, so this PR also drops the flag. The WGSL spec issue gpuweb/gpuweb#5109 mentioned in the comment explains the problem. It has also been discussed in the past as #11321.