[NFC][LLVM] Cleanup pass initialization for wasm/LoongArch (#134452)

- Remove calls to pass initialization from pass constructors.
- llvm/llvm-project#111767

Author: jurahul

llvm/lib/Target/LoongArch/LoongArchExpandAtomicPseudoInsts.cpp

@@ -33,9 +33,7 @@ class LoongArchExpandAtomicPseudo : public MachineFunctionPass {
   const LoongArchInstrInfo *TII;
   static char ID;
 
-  LoongArchExpandAtomicPseudo() : MachineFunctionPass(ID) {
-    initializeLoongArchExpandAtomicPseudoPass(*PassRegistry::getPassRegistry());
-  }
+  LoongArchExpandAtomicPseudo() : MachineFunctionPass(ID) {}
 
   bool runOnMachineFunction(MachineFunction &MF) override;
 

llvm/lib/Target/LoongArch/LoongArchExpandPseudoInsts.cpp

@@ -41,9 +41,7 @@ class LoongArchPreRAExpandPseudo : public MachineFunctionPass {
   const LoongArchInstrInfo *TII;
   static char ID;
 
-  LoongArchPreRAExpandPseudo() : MachineFunctionPass(ID) {
-    initializeLoongArchPreRAExpandPseudoPass(*PassRegistry::getPassRegistry());
-  }
+  LoongArchPreRAExpandPseudo() : MachineFunctionPass(ID) {}
 
   bool runOnMachineFunction(MachineFunction &MF) override;
 
@@ -656,9 +654,7 @@ class LoongArchExpandPseudo : public MachineFunctionPass {
   const LoongArchInstrInfo *TII;
   static char ID;
 
-  LoongArchExpandPseudo() : MachineFunctionPass(ID) {
-    initializeLoongArchExpandPseudoPass(*PassRegistry::getPassRegistry());
-  }
+  LoongArchExpandPseudo() : MachineFunctionPass(ID) {}
 
   bool runOnMachineFunction(MachineFunction &MF) override;
 

llvm/lib/Target/LoongArch/LoongArchTargetMachine.cpp

@@ -40,6 +40,7 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeLoongArchTarget() {
   initializeLoongArchPreRAExpandPseudoPass(*PR);
   initializeLoongArchExpandPseudoPass(*PR);
   initializeLoongArchDAGToDAGISelLegacyPass(*PR);
+  initializeLoongArchExpandAtomicPseudoPass(*PR);
 }
 
 static cl::opt<bool> EnableLoongArchDeadRegisterElimination(

llvm/lib/Target/WebAssembly/WebAssemblyExceptionInfo.h

@@ -132,9 +132,7 @@ class WebAssemblyExceptionInfo final : public MachineFunctionPass {
 
 public:
   static char ID;
-  WebAssemblyExceptionInfo() : MachineFunctionPass(ID) {
-    initializeWebAssemblyExceptionInfoPass(*PassRegistry::getPassRegistry());
-  }
+  WebAssemblyExceptionInfo() : MachineFunctionPass(ID) {}
   ~WebAssemblyExceptionInfo() override { releaseMemory(); }
   WebAssemblyExceptionInfo(const WebAssemblyExceptionInfo &) = delete;
   WebAssemblyExceptionInfo &