[AST] Use llvm::iterator_range::empty (NFC)

clang/lib/AST/ByteCode/Compiler.cpp

@@ -5895,7 +5895,7 @@ bool Compiler<Emitter>::emitLambdaStaticInvokerBody(const CXXMethodDecl *MD) {
 
   const CXXRecordDecl *ClosureClass = MD->getParent();
   const CXXMethodDecl *LambdaCallOp = ClosureClass->getLambdaCallOperator();
-  assert(ClosureClass->captures_begin() == ClosureClass->captures_end());
+  assert(ClosureClass->captures().empty());
   const Function *Func = this->getFunction(LambdaCallOp);
   if (!Func)
     return false;

clang/lib/AST/ByteCode/Context.cpp

@@ -474,7 +474,7 @@ const Function *Context::getOrCreateFunction(const FunctionDecl *FuncDecl) {
     IsLambdaStaticInvoker = true;
 
     const CXXRecordDecl *ClosureClass = MD->getParent();
-    assert(ClosureClass->captures_begin() == ClosureClass->captures_end());
+    assert(ClosureClass->captures().empty());
     if (ClosureClass->isGenericLambda()) {
       const CXXMethodDecl *LambdaCallOp = ClosureClass->getLambdaCallOperator();
       assert(MD->isFunctionTemplateSpecialization() &&

clang/lib/AST/DeclCXX.cpp

@@ -1983,7 +1983,7 @@ CXXRecordDecl::getVisibleConversionFunctions() const {
   ASTContext &Ctx = getASTContext();
 
   ASTUnresolvedSet *Set;
-  if (bases_begin() == bases_end()) {
+  if (bases().empty()) {
     // If root class, all conversions are visible.
     Set = &data().Conversions.get(Ctx);
   } else {

clang/lib/AST/DeclPrinter.cpp

@@ -1443,7 +1443,7 @@ void DeclPrinter::VisitObjCMethodDecl(ObjCMethodDecl *OMD) {
     lastPos = pos + 1;
   }
 
-  if (OMD->param_begin() == OMD->param_end())
+  if (OMD->parameters().empty())
     Out << name;
 
   if (OMD->isVariadic())
@@ -1480,8 +1480,7 @@ void DeclPrinter::VisitObjCImplementationDecl(ObjCImplementationDecl *OID) {
     }
     Indentation -= Policy.Indentation;
     Out << "}\n";
-  }
-  else if (SID || (OID->decls_begin() != OID->decls_end())) {
+  } else if (SID || !OID->decls().empty()) {
     Out << "\n";
     eolnOut = true;
   }
@@ -1540,8 +1539,7 @@ void DeclPrinter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *OID) {
     }
     Indentation -= Policy.Indentation;
     Out << "}\n";
-  }
-  else if (SID || (OID->decls_begin() != OID->decls_end())) {
+  } else if (SID || !OID->decls().empty()) {
     Out << "\n";
     eolnOut = true;
   }

clang/lib/AST/ExprConstant.cpp

@@ -8436,7 +8436,7 @@ class ExprEvaluatorBase
         // doesn't have an implicit argument passed in.
         const CXXRecordDecl *ClosureClass = MD->getParent();
         assert(
-            ClosureClass->captures_begin() == ClosureClass->captures_end() &&
+            ClosureClass->captures().empty() &&
             "Number of captures must be zero for conversion to function-ptr");
 
         const CXXMethodDecl *LambdaCallOp =

clang/lib/AST/QualTypeNames.cpp

@@ -273,7 +273,7 @@ static NestedNameSpecifier *createNestedNameSpecifierForScopeOf(
         //
         // Make the situation is 'useable' but looking a bit odd by
         // picking a random instance as the declaring context.
-        if (ClassTempl->spec_begin() != ClassTempl->spec_end()) {
+        if (!ClassTempl->specializations().empty()) {
           Decl = *(ClassTempl->spec_begin());
           Outer = dyn_cast<NamedDecl>(Decl);
           OuterNS = dyn_cast<NamespaceDecl>(Decl);