[llvm] AMDGPU/GlobalISel: Regbanklegalize rules for G_INTRINSIC_FPTRUNC_ROUND (PR #185491)

[Petar Avramovic via llvm-commits]

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petar-avramovic wrote:

needs to be checked a bit maybe tablegen is missing something, there is s_cvt_f16_f32 on gfx12 and we are not selecting it

https://github.com/llvm/llvm-project/pull/185491