[NFC] Use more isa and isa_and_nonnull instead dyn_cast for predicates (#137393)

Also fix some typos in comments

---------

Co-authored-by: Mehdi Amini <joker.eph@gmail.com>

Author: MaxGraey

clang/lib/Sema/SemaChecking.cpp

@@ -10052,9 +10052,10 @@ void CheckFreeArgumentsAddressof(Sema &S, const std::string &CalleeName,
                                  const UnaryOperator *UnaryExpr) {
   if (const auto *Lvalue = dyn_cast<DeclRefExpr>(UnaryExpr->getSubExpr())) {
     const Decl *D = Lvalue->getDecl();
-    if (isa<DeclaratorDecl>(D))
-      if (!dyn_cast<DeclaratorDecl>(D)->getType()->isReferenceType())
+    if (auto *DD = dyn_cast<DeclaratorDecl>(D)) {
+      if (!DD->getType()->isReferenceType())
         return CheckFreeArgumentsOnLvalue(S, CalleeName, UnaryExpr, D);
+    }
   }
 
   if (const auto *Lvalue = dyn_cast<MemberExpr>(UnaryExpr->getSubExpr()))

clang/lib/Sema/SemaModule.cpp

@@ -942,7 +942,7 @@ static bool checkExportedDecl(Sema &S, Decl *D, SourceLocation BlockStart) {
   // HLSL: export declaration is valid only on functions
   if (S.getLangOpts().HLSL) {
     // Export-within-export was already diagnosed in ActOnStartExportDecl
-    if (!dyn_cast<FunctionDecl>(D) && !dyn_cast<ExportDecl>(D)) {
+    if (!isa<FunctionDecl, ExportDecl>(D)) {
       S.Diag(D->getBeginLoc(), diag::err_hlsl_export_not_on_function);
       D->setInvalidDecl();
       return false;

clang/lib/Sema/SemaOpenMP.cpp

@@ -2307,7 +2307,7 @@ bool SemaOpenMP::isInOpenMPTargetExecutionDirective() const {
 
 bool SemaOpenMP::isOpenMPRebuildMemberExpr(ValueDecl *D) {
   // Only rebuild for Field.
-  if (!dyn_cast<FieldDecl>(D))
+  if (!isa<FieldDecl>(D))
     return false;
   DSAStackTy::DSAVarData DVarPrivate = DSAStack->hasDSA(
       D,

clang/lib/StaticAnalyzer/Checkers/WebKit/RawPtrRefLocalVarsChecker.cpp

@@ -356,7 +356,7 @@ class RawPtrRefLocalVarsChecker
     SmallString<100> Buf;
     llvm::raw_svector_ostream Os(Buf);
 
-    if (dyn_cast<ParmVarDecl>(V)) {
+    if (isa<ParmVarDecl>(V)) {
       Os << "Assignment to an " << ptrKind() << " parameter ";
       printQuotedQualifiedName(Os, V);
       Os << " is unsafe.";

lld/MachO/SymbolTable.cpp

@@ -518,7 +518,7 @@ static const Symbol *getAlternativeSpelling(const Undefined &sym,
 
     // If in the symbol table and not undefined.
     if (const Symbol *s = symtab->find(newName))
-      if (dyn_cast<Undefined>(s) == nullptr)
+      if (!isa<Undefined>(s))
         return s;
 
     return nullptr;
@@ -567,8 +567,7 @@ static const Symbol *getAlternativeSpelling(const Undefined &sym,
     if (name.equals_insensitive(it.first))
       return it.second;
   for (Symbol *sym : symtab->getSymbols())
-    if (dyn_cast<Undefined>(sym) == nullptr &&
-        name.equals_insensitive(sym->getName()))
+    if (!isa<Undefined>(sym) && name.equals_insensitive(sym->getName()))
       return sym;
 
   // The reference may be a mangled name while the definition is not. Suggest a

llvm/include/llvm/Analysis/LoopInfo.h

@@ -529,7 +529,7 @@ class LoopInfo : public LoopInfoBase<BasicBlock, Loop> {
   }
 
   // Return true if a new use of V added in ExitBB would require an LCSSA PHI
-  // to be inserted at the begining of the block.  Note that V is assumed to
+  // to be inserted at the beginning of the block.  Note that V is assumed to
   // dominate ExitBB, and ExitBB must be the exit block of some loop.  The
   // IR is assumed to be in LCSSA form before the planned insertion.
   bool wouldBeOutOfLoopUseRequiringLCSSA(const Value *V,

llvm/lib/Bitcode/Reader/MetadataLoader.cpp

@@ -558,7 +558,7 @@ class MetadataLoader::MetadataLoaderImpl {
           SetVector<Metadata *> EntitiesToRemove;
           for (Metadata *Op : CU->getImportedEntities()->operands()) {
             auto *IE = cast<DIImportedEntity>(Op);
-            if (dyn_cast_or_null<DILocalScope>(IE->getScope())) {
+            if (isa_and_nonnull<DILocalScope>(IE->getScope())) {
               EntitiesToRemove.insert(IE);
             }
           }

llvm/lib/IR/Verifier.cpp

@@ -6584,7 +6584,7 @@ void Verifier::visitIntrinsicCall(Intrinsic::ID ID, CallBase &Call) {
       for (BasicBlock *ColorFirstBB : CV)
         if (auto It = ColorFirstBB->getFirstNonPHIIt();
             It != ColorFirstBB->end())
-          if (dyn_cast_or_null<FuncletPadInst>(&*It))
+          if (isa_and_nonnull<FuncletPadInst>(&*It))
             InEHFunclet = true;
 
       // Check for funclet operand bundle

llvm/lib/Target/WebAssembly/WebAssemblyTargetTransformInfo.cpp

@@ -294,7 +294,7 @@ bool WebAssemblyTTIImpl::isProfitableToSinkOperands(
 
   Value *V = I->getOperand(1);
   // We dont need to sink constant splat.
-  if (dyn_cast<Constant>(V))
+  if (isa<Constant>(V))
     return false;
 
   if (match(V, m_Shuffle(m_InsertElt(m_Value(), m_Value(), m_ZeroInt()),

mlir/lib/Conversion/LLVMCommon/TypeConverter.cpp

@@ -755,7 +755,7 @@ LLVMTypeConverter::promoteOperands(Location loc, ValueRange opOperands,
     if (useBarePtrCallConv) {
       // For the bare-ptr calling convention, we only have to extract the
       // aligned pointer of a memref.
-      if (dyn_cast<MemRefType>(operand.getType())) {
+      if (isa<MemRefType>(operand.getType())) {
         MemRefDescriptor desc(llvmOperand);
         llvmOperand = desc.alignedPtr(builder, loc);
       } else if (isa<UnrankedMemRefType>(operand.getType())) {