AMDGPU: Respect amdgpu-no-agpr in functions and with calls (#128147) Remove the MIR scan to detect whether AGPRs are used or not, and the special case for callable functions. This behavior was confusing, and not overridable. The amdgpu-no-agpr attribute was intended to avoid this imprecise heuristic for how many AGPRs to allocate. It was also too confusing to make this interact with the pending amdgpu-num-agpr replacement for amdgpu-no-agpr. Also adds an xfail-ish test where the register allocator asserts after allocation fails which I ran into. Future work should reintroduce a more refined MIR scan to estimate AGPR pressure for how to split AGPRs and VGPRs.
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