[CodeGen] Remove unnecessary casts (NFC) (#146463)

Both of these functions return void.

Author: kazutakahirata

clang/lib/CodeGen/CGStmtOpenMP.cpp

@@ -713,7 +713,7 @@ CodeGenFunction::GenerateOpenMPCapturedStmtFunction(const CapturedStmt &S,
     VLASizeMap[VLASizePair.second.first] = VLASizePair.second.second;
   PGO->assignRegionCounters(GlobalDecl(CD), F);
   CapturedStmtInfo->EmitBody(*this, CD->getBody());
-  (void)LocalScope.ForceCleanup();
+  LocalScope.ForceCleanup();
   FinishFunction(CD->getBodyRBrace());
   if (!NeedWrapperFunction)
     return F;

clang/lib/CodeGen/ConstantInitBuilder.cpp

@@ -160,7 +160,7 @@ ConstantAggregateBuilderBase::getAddrOfPosition(llvm::Type *type,
                                         nullptr, "");
   Builder.SelfReferences.emplace_back(dummy);
   auto &entry = Builder.SelfReferences.back();
-  (void)getGEPIndicesTo(entry.Indices, position + Begin);
+  getGEPIndicesTo(entry.Indices, position + Begin);
   return dummy;
 }