[llvm] Remove redundant control flow statements (NFC) (#163509)

Author: kazutakahirata

llvm/include/llvm/Analysis/IR2Vec.h

@@ -575,7 +575,7 @@ class Embedder {
   /// cached embeddings should be invalidated to ensure
   /// correctness/recomputation. This is a no-op for SymbolicEmbedder but
   /// removes all the cached entries in FlowAwareEmbedder.
-  virtual void invalidateEmbeddings() { return; }
+  virtual void invalidateEmbeddings() {}
 };
 
 /// Class for computing the Symbolic embeddings of IR2Vec.

llvm/lib/CAS/OnDiskTrieRawHashMap.cpp

@@ -1102,8 +1102,6 @@ void TrieRawHashMapHandle::print(
 
   if (auto Err = Printer.printRecords())
     OS << "error: " << toString(std::move(Err)) << "\n";
-
-  return;
 }
 
 Error TrieRawHashMapHandle::validate(

llvm/lib/Target/AMDGPU/SIPreEmitPeephole.cpp

@@ -654,7 +654,6 @@ void SIPreEmitPeephole::collectUnpackingCandidates(
     if (TotalCyclesBetweenCandidates < NumMFMACycles - 1)
       InstrsToUnpack.insert(&Instr);
   }
-  return;
 }
 
 void SIPreEmitPeephole::performF32Unpacking(MachineInstr &I) {
@@ -681,7 +680,6 @@ void SIPreEmitPeephole::performF32Unpacking(MachineInstr &I) {
   HiDstOp.setIsRenamable(DstOp.isRenamable());
 
   I.eraseFromParent();
-  return;
 }
 
 MachineInstrBuilder SIPreEmitPeephole::createUnpackedMI(MachineInstr &I,

llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp

@@ -3765,7 +3765,6 @@ void SPIRVInstructionSelector::decorateUsesAsNonUniform(
                       SPIRV::Decoration::NonUniformEXT, {});
     }
   }
-  return;
 }
 
 bool SPIRVInstructionSelector::extractSubvector(

llvm/lib/Transforms/Utils/LoopUnroll.cpp

@@ -1106,7 +1106,6 @@ llvm::UnrollLoop(Loop *L, UnrollLoopOptions ULO, LoopInfo *LI,
       }
 
       Phi.replaceAllUsesWith(RdxResult);
-      continue;
     }
   }