[NFC][LLVM][RISCV] Cleanup pass initialization for RISCV (#134279)

- Move calls to pass initialization functions to RISCV target
initialization and remove them from pass constructors.

Author: jurahul

llvm/lib/Target/RISCV/GISel/RISCVO0PreLegalizerCombiner.cpp

@@ -110,8 +110,6 @@ void RISCVO0PreLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const {
 
 RISCVO0PreLegalizerCombiner::RISCVO0PreLegalizerCombiner()
     : MachineFunctionPass(ID) {
-  initializeRISCVO0PreLegalizerCombinerPass(*PassRegistry::getPassRegistry());
-
   if (!RuleConfig.parseCommandLineOption())
     report_fatal_error("Invalid rule identifier");
 }
@@ -150,8 +148,6 @@ INITIALIZE_PASS_END(RISCVO0PreLegalizerCombiner, DEBUG_TYPE,
                     "Combine RISC-V machine instrs before legalization", false,
                     false)
 
-namespace llvm {
-FunctionPass *createRISCVO0PreLegalizerCombiner() {
+FunctionPass *llvm::createRISCVO0PreLegalizerCombiner() {
   return new RISCVO0PreLegalizerCombiner();
 }
-} // end namespace llvm

llvm/lib/Target/RISCV/GISel/RISCVPostLegalizerCombiner.cpp

@@ -118,8 +118,6 @@ void RISCVPostLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const {
 
 RISCVPostLegalizerCombiner::RISCVPostLegalizerCombiner()
     : MachineFunctionPass(ID) {
-  initializeRISCVPostLegalizerCombinerPass(*PassRegistry::getPassRegistry());
-
   if (!RuleConfig.parseCommandLineOption())
     report_fatal_error("Invalid rule identifier");
 }
@@ -164,8 +162,6 @@ INITIALIZE_PASS_END(RISCVPostLegalizerCombiner, DEBUG_TYPE,
                     "Combine RISC-V MachineInstrs after legalization", false,
                     false)
 
-namespace llvm {
-FunctionPass *createRISCVPostLegalizerCombiner() {
+FunctionPass *llvm::createRISCVPostLegalizerCombiner() {
   return new RISCVPostLegalizerCombiner();
 }
-} // end namespace llvm

llvm/lib/Target/RISCV/GISel/RISCVPreLegalizerCombiner.cpp

@@ -116,8 +116,6 @@ void RISCVPreLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const {
 
 RISCVPreLegalizerCombiner::RISCVPreLegalizerCombiner()
     : MachineFunctionPass(ID) {
-  initializeRISCVPreLegalizerCombinerPass(*PassRegistry::getPassRegistry());
-
   if (!RuleConfig.parseCommandLineOption())
     report_fatal_error("Invalid rule identifier");
 }
@@ -167,8 +165,6 @@ INITIALIZE_PASS_END(RISCVPreLegalizerCombiner, DEBUG_TYPE,
                     "Combine RISC-V machine instrs before legalization", false,
                     false)
 
-namespace llvm {
-FunctionPass *createRISCVPreLegalizerCombiner() {
+FunctionPass *llvm::createRISCVPreLegalizerCombiner() {
   return new RISCVPreLegalizerCombiner();
 }
-} // end namespace llvm

llvm/lib/Target/RISCV/RISCVExpandAtomicPseudoInsts.cpp

@@ -34,9 +34,7 @@ class RISCVExpandAtomicPseudo : public MachineFunctionPass {
   const RISCVInstrInfo *TII;
   static char ID;
 
-  RISCVExpandAtomicPseudo() : MachineFunctionPass(ID) {
-    initializeRISCVExpandAtomicPseudoPass(*PassRegistry::getPassRegistry());
-  }
+  RISCVExpandAtomicPseudo() : MachineFunctionPass(ID) {}
 
   bool runOnMachineFunction(MachineFunction &MF) override;
 
@@ -733,10 +731,6 @@ bool RISCVExpandAtomicPseudo::expandAtomicCmpXchg(
 INITIALIZE_PASS(RISCVExpandAtomicPseudo, "riscv-expand-atomic-pseudo",
                 RISCV_EXPAND_ATOMIC_PSEUDO_NAME, false, false)
 
-namespace llvm {
-
-FunctionPass *createRISCVExpandAtomicPseudoPass() {
+FunctionPass *llvm::createRISCVExpandAtomicPseudoPass() {
   return new RISCVExpandAtomicPseudo();
 }
-
-} // end of namespace llvm

llvm/lib/Target/RISCV/RISCVRedundantCopyElimination.cpp

@@ -44,10 +44,7 @@ class RISCVRedundantCopyElimination : public MachineFunctionPass {
 
 public:
   static char ID;
-  RISCVRedundantCopyElimination() : MachineFunctionPass(ID) {
-    initializeRISCVRedundantCopyEliminationPass(
-        *PassRegistry::getPassRegistry());
-  }
+  RISCVRedundantCopyElimination() : MachineFunctionPass(ID) {}
 
   bool runOnMachineFunction(MachineFunction &MF) override;
   MachineFunctionProperties getRequiredProperties() const override {

llvm/lib/Target/RISCV/RISCVTargetMachine.cpp

@@ -147,6 +147,8 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeRISCVTarget() {
   initializeRISCVMoveMergePass(*PR);
   initializeRISCVPushPopOptPass(*PR);
   initializeRISCVLoadStoreOptPass(*PR);
+  initializeRISCVExpandAtomicPseudoPass(*PR);
+  initializeRISCVRedundantCopyEliminationPass(*PR);
 }
 
 static StringRef computeDataLayout(const Triple &TT,