llvm-project

52317363 - [AMDGPU] Do not allow M0 as v_readfirstlane_b32 dst (#128851)

[AMDGPU] Do not allow M0 as v_readfirstlane_b32 dst (#128851) M0 can only be written to by the SALU, so `v_readfirstlane_b32 m0` is effectively useless. Represent this by restricting the dest RC of that instruction to `SReg_32_XM0` which excludes M0. There is a lot of test changes due to the register class changing, but most changes are trivial. In some cases, an extra register and `s_mov_b32` is needed. Fixes SWDEV-513269