Revert "[AMDGPU] Intrinsic for launching whole wave functions" (#152286)

Reverts llvm/llvm-project#145859 because it broke a HIP test:
```
[34/59] Building CXX object External/HIP/CMakeFiles/TheNextWeek-hip-6.3.0.dir/workload/ray-tracing/TheNextWeek/main.cc.o
FAILED: External/HIP/CMakeFiles/TheNextWeek-hip-6.3.0.dir/workload/ray-tracing/TheNextWeek/main.cc.o 
/home/botworker/bbot/clang-hip-vega20/botworker/clang-hip-vega20/llvm/bin/clang++ -DNDEBUG  -O3 -DNDEBUG   -w -Werror=date-time --rocm-path=/opt/botworker/llvm/External/hip/rocm-6.3.0 --offload-arch=gfx908 --offload-arch=gfx90a --offload-arch=gfx1030 --offload-arch=gfx1100 -xhip -mfma -MD -MT External/HIP/CMakeFiles/TheNextWeek-hip-6.3.0.dir/workload/ray-tracing/TheNextWeek/main.cc.o -MF External/HIP/CMakeFiles/TheNextWeek-hip-6.3.0.dir/workload/ray-tracing/TheNextWeek/main.cc.o.d -o External/HIP/CMakeFiles/TheNextWeek-hip-6.3.0.dir/workload/ray-tracing/TheNextWeek/main.cc.o -c /home/botworker/bbot/clang-hip-vega20/llvm-test-suite/External/HIP/workload/ray-tracing/TheNextWeek/main.cc
fatal error: error in backend: Cannot select: intrinsic %llvm.amdgcn.readfirstlane
```

1 files changed, 0 insertions, 37 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index d5b9040..d0815e9 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -7984,43 +7984,6 @@ void SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I,
     HasTailCall = true;
     return;
   }
-  case Intrinsic::amdgcn_call_whole_wave: {
-    TargetLowering::ArgListTy Args;
-
-    // The first argument is the callee. Skip it when assembling the call args.
-    TargetLowering::ArgListEntry Arg;
-    for (unsigned Idx = 1; Idx < I.arg_size(); ++Idx) {
-      Arg.Node = getValue(I.getArgOperand(Idx));
-      Arg.Ty = I.getArgOperand(Idx)->getType();
-      Arg.setAttributes(&I, Idx);
-      Args.push_back(Arg);
-    }
-
-    SDValue ConvControlToken;
-    if (auto Bundle = I.getOperandBundle(LLVMContext::OB_convergencectrl)) {
-      auto *Token = Bundle->Inputs[0].get();
-      ConvControlToken = getValue(Token);
-    }
-
-    TargetLowering::CallLoweringInfo CLI(DAG);
-    CLI.setDebugLoc(getCurSDLoc())
-        .setChain(getRoot())
-        .setCallee(CallingConv::AMDGPU_Gfx_WholeWave, I.getType(),
-                   getValue(I.getArgOperand(0)), std::move(Args))
-        .setTailCall(false)
-        .setIsPreallocated(
-            I.countOperandBundlesOfType(LLVMContext::OB_preallocated) != 0)
-        .setConvergent(I.isConvergent())
-        .setConvergenceControlToken(ConvControlToken);
-    CLI.CB = &I;
-
-    std::pair<SDValue, SDValue> Result =
-        lowerInvokable(CLI, /*EHPadBB=*/nullptr);
-
-    if (Result.first.getNode())
-      setValue(&I, Result.first);
-    return;
-  }
   case Intrinsic::ptrmask: {
     SDValue Ptr = getValue(I.getOperand(0));
     SDValue Mask = getValue(I.getOperand(1));