AMDGPU: Remove r600 local id annotations in AMDGPULowerIntrinsics

[arsenm]

Summary

With these dropped and memory intrinsic moved into a generic pass, we
can drop the whole pass.

No tests fail with this removed. The new amdgcn intrinsics are
annotated in clang up front. Theoretically may regress r600, but that
would need new testing and support work (r600 ideally would also
follow the clang handling).

If we wanted to refine these values, a better place would be in
AMDGPUAttributor.

[arsenm]

8eae660ae0bd0eaded7fca2bdc6002a3444aabaf

I remembered I taught the DAG computeKnownBits about this directly, so the r600 regression would only be from IR passes using known bits between here and the DAG, and I don't know what that would be

llvm/lib/Target/AMDGPU/AMDGPULowerIntrinsics.cpp

for (Function &F : M) {
 
     switch (F.getIntrinsicID()) {
     case Intrinsic::memcpy:
     case Intrinsic::memmove:
     case Intrinsic::memset:
       if (expandMemIntrinsicUses(F))
         Changed = true;
       break;
-
-    case Intrinsic::r600_read_tidig_x:
-    case Intrinsic::r600_read_tidig_y:
-    case Intrinsic::r600_read_tidig_z:
-    case Intrinsic::r600_read_local_size_x:
-    case Intrinsic::r600_read_local_size_y:
-    case Intrinsic::r600_read_local_size_z:
-      Changed |= makeLIDRangeMetadata(F);
-      break;
-
     default:
       break;
     }
   }
 
   return Changed;
 }
 
 ModulePass *llvm::createAMDGPULowerIntrinsicsPass() {
   return new AMDGPULowerIntrinsics();
 }