[clang] [llvm] AMDGPU: Add builtin/intrinsic global_(load|store)_b128 (PR #172090)

[Matt Arsenault via cfe-commits]

================
@@ -1649,6 +1649,26 @@ bool SITargetLowering::getTgtMemIntrinsic(IntrinsicInfo &Info,
     Info.flags |= MachineMemOperand::MOLoad | MachineMemOperand::MOStore;
     return true;
   }
+  case Intrinsic::amdgcn_global_load_b128:
+  case Intrinsic::amdgcn_global_store_b128: {
+    bool IsStore = IntrID == Intrinsic::amdgcn_global_store_b128;
+    Info.opc = IsStore ? ISD::INTRINSIC_VOID : ISD::INTRINSIC_W_CHAIN;
+    Info.memVT = EVT::getIntegerVT(CI.getContext(), 128);
----------------
arsenm wrote:

```suggestion
    Info.memVT = MVT::v4i32;
```

https://github.com/llvm/llvm-project/pull/172090