[AMDGPU] Removed unused method

Summary:
I accidentally left this behind in D50306, and it causes a build warning
when I build with gcc7.

Subscribers: arsenm, kzhuravl, jvesely, wdng, nhaehnle, yaxunl, dstuttard, t-tye, llvm-commits

Differential Revision: https://reviews.llvm.org/D52022

Change-Id: I30f7a47047e9d9d841f652da66d2fea19e74842c

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342189 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Tim Renouf

lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp

@@ -141,9 +141,6 @@ class AMDGPUDAGToDAGISel : public SelectionDAGISel {
                          SDValue &Offset, SDValue &SLC) const;
   bool SelectMUBUFOffset(SDValue Addr, SDValue &SRsrc, SDValue &Soffset,
                          SDValue &Offset) const;
-  bool SelectMUBUFConstant(SDValue Constant,
-                           SDValue &SOffset,
-                           SDValue &ImmOffset) const;
 
   bool SelectFlatAtomic(SDValue Addr, SDValue &VAddr,
                         SDValue &Offset, SDValue &SLC) const;
@@ -1281,25 +1278,6 @@ bool AMDGPUDAGToDAGISel::SelectMUBUFOffset(SDValue Addr, SDValue &SRsrc,
   return SelectMUBUFOffset(Addr, SRsrc, Soffset, Offset, GLC, SLC, TFE);
 }
 
-bool AMDGPUDAGToDAGISel::SelectMUBUFConstant(SDValue Constant,
-                                             SDValue &SOffset,
-                                             SDValue &ImmOffset) const {
-  SDLoc DL(Constant);
-  uint32_t Imm = cast<ConstantSDNode>(Constant)->getZExtValue();
-  uint32_t Overflow;
-  if (!AMDGPU::splitMUBUFOffset(Imm, Overflow, Imm, Subtarget))
-    return false;
-  ImmOffset = CurDAG->getTargetConstant(Imm, DL, MVT::i16);
-  if (Overflow <= 64)
-    SOffset = CurDAG->getTargetConstant(Overflow, DL, MVT::i32);
-  else
-    SOffset = SDValue(CurDAG->getMachineNode(AMDGPU::S_MOV_B32, DL, MVT::i32,
-                      CurDAG->getTargetConstant(Overflow, DL, MVT::i32)),
-                      0);
-
-  return true;
-}
-
 template <bool IsSigned>
 bool AMDGPUDAGToDAGISel::SelectFlatOffset(SDValue Addr,
                                           SDValue &VAddr,