[AMDGPU] Lower __builtin_amdgcn_read_exec_hi to use amdgcn_ballot (#69567)
Currently __builtin_amdgcn_read_exec_hi lowers to llvm.read_register, this patch lowers it to use amdgcn_ballot.
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Currently __builtin_amdgcn_read_exec_hi lowers to llvm.read_register, this patch lowers it to use amdgcn_ballot.