Remove GlobalISel changes not needed yet

Author: tex3d

llvm/include/llvm/Target/GlobalISel/SelectionDAGCompat.td

@@ -154,7 +154,6 @@ def : GINodeEquiv<G_FTAN, ftan>;
 def : GINodeEquiv<G_FACOS, facos>;
 def : GINodeEquiv<G_FASIN, fasin>;
 def : GINodeEquiv<G_FATAN, fatan>;
-def : GINodeEquiv<G_FATAN2, fatan2>;
 def : GINodeEquiv<G_FCOSH, fcosh>;
 def : GINodeEquiv<G_FSINH, fsinh>;
 def : GINodeEquiv<G_FTANH, ftanh>;

llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp

@@ -457,8 +457,6 @@ static RTLIB::Libcall getRTLibDesc(unsigned Opcode, unsigned Size) {
     RTLIBCASE(ACOS_F);
   case TargetOpcode::G_FATAN:
     RTLIBCASE(ATAN_F);
-  case TargetOpcode::G_FATAN2:
-    RTLIBCASE(ATAN2_F);
   case TargetOpcode::G_FSINH:
     RTLIBCASE(SINH_F);
   case TargetOpcode::G_FCOSH:
@@ -1204,7 +1202,6 @@ LegalizerHelper::libcall(MachineInstr &MI, LostDebugLocObserver &LocObserver) {
   case TargetOpcode::G_FACOS:
   case TargetOpcode::G_FASIN:
   case TargetOpcode::G_FATAN:
-  case TargetOpcode::G_FATAN2:
   case TargetOpcode::G_FCOSH:
   case TargetOpcode::G_FSINH:
   case TargetOpcode::G_FTANH:
@@ -3125,7 +3122,6 @@ LegalizerHelper::widenScalar(MachineInstr &MI, unsigned TypeIdx, LLT WideTy) {
   case TargetOpcode::G_FACOS:
   case TargetOpcode::G_FASIN:
   case TargetOpcode::G_FATAN:
-  case TargetOpcode::G_FATAN2:
   case TargetOpcode::G_FCOSH:
   case TargetOpcode::G_FSINH:
   case TargetOpcode::G_FTANH:

llvm/lib/CodeGen/GlobalISel/Utils.cpp

@@ -828,7 +828,6 @@ bool llvm::isKnownNeverNaN(Register Val, const MachineRegisterInfo &MRI,
   case TargetOpcode::G_FACOS:
   case TargetOpcode::G_FASIN:
   case TargetOpcode::G_FATAN:
-  case TargetOpcode::G_FATAN2:
   case TargetOpcode::G_FCOSH:
   case TargetOpcode::G_FSINH:
   case TargetOpcode::G_FTANH:
@@ -1716,7 +1715,6 @@ bool llvm::isPreISelGenericFloatingPointOpcode(unsigned Opc) {
   case TargetOpcode::G_FACOS:
   case TargetOpcode::G_FASIN:
   case TargetOpcode::G_FATAN:
-  case TargetOpcode::G_FATAN2:
   case TargetOpcode::G_FCOSH:
   case TargetOpcode::G_FSINH:
   case TargetOpcode::G_FTANH: