b1d42465fc
It is possible that the number of hidden arguments that are selected to be preloaded in AMDGPULowerKernel arguments and isel can differ. This isn't an issue with explicit arguments since isel can lower the argument correctly either way, but with hidden arguments we may have alignment issues if we try to load these hidden arguments that were added to the kernel signature. The reason for the mismatch is that isel reserves an extra synthetic user SGPR for module LDS. Instead of teaching lowerFormalArguments how to handle these properly it makes more sense and is less expensive to fix the mismatch and assert if we ever run into this issue again. We should never be trying to lower these in the normal way. In a future change we probably want to revise how we track "synthetic" user SGPRs and unify the handling in GCNUserSGPRUsageInfo. Sometimes synthetic SGPRSs are considered user SGPRs and sometimes they are not. Until then this patch resolves the inconsistency, fixes the bug, and is otherwise a NFC.
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