[clangd] Fix typo in function name in AST.cpp (#77504)

Author: Nour1248

clang-tools-extra/clangd/AST.cpp

@@ -757,7 +757,7 @@ const TemplateTypeParmType *getFunctionPackType(const FunctionDecl *Callee) {
 // Returns the template parameter pack type that this parameter was expanded
 // from (if in the Args... or Args&... or Args&&... form), if this is the case,
 // nullptr otherwise.
-const TemplateTypeParmType *getUnderylingPackType(const ParmVarDecl *Param) {
+const TemplateTypeParmType *getUnderlyingPackType(const ParmVarDecl *Param) {
   const auto *PlainType = Param->getType().getTypePtr();
   if (auto *RT = dyn_cast<ReferenceType>(PlainType))
     PlainType = RT->getPointeeTypeAsWritten().getTypePtr();
@@ -793,8 +793,8 @@ class ForwardingCallVisitor
     : public RecursiveASTVisitor<ForwardingCallVisitor> {
 public:
   ForwardingCallVisitor(ArrayRef<const ParmVarDecl *> Parameters)
-      : Parameters{Parameters}, PackType{getUnderylingPackType(
-                                    Parameters.front())} {}
+      : Parameters{Parameters},
+        PackType{getUnderlyingPackType(Parameters.front())} {}
 
   bool VisitCallExpr(CallExpr *E) {
     auto *Callee = getCalleeDeclOrUniqueOverload(E);
@@ -859,7 +859,7 @@ class ForwardingCallVisitor
     if (const auto *TTPT = getFunctionPackType(Callee)) {
       // In this case: Separate the parameters into head, pack and tail
       auto IsExpandedPack = [&](const ParmVarDecl *P) {
-        return getUnderylingPackType(P) == TTPT;
+        return getUnderlyingPackType(P) == TTPT;
       };
       ForwardingInfo FI;
       FI.Head = MatchingParams.take_until(IsExpandedPack);
@@ -964,7 +964,7 @@ resolveForwardingParameters(const FunctionDecl *D, unsigned MaxDepth) {
   if (const auto *TTPT = getFunctionPackType(D)) {
     // Split the parameters into head, pack and tail
     auto IsExpandedPack = [TTPT](const ParmVarDecl *P) {
-      return getUnderylingPackType(P) == TTPT;
+      return getUnderlyingPackType(P) == TTPT;
     };
     ArrayRef<const ParmVarDecl *> Head = Parameters.take_until(IsExpandedPack);
     ArrayRef<const ParmVarDecl *> Pack =
@@ -1016,7 +1016,7 @@ resolveForwardingParameters(const FunctionDecl *D, unsigned MaxDepth) {
 }
 
 bool isExpandedFromParameterPack(const ParmVarDecl *D) {
-  return getUnderylingPackType(D) != nullptr;
+  return getUnderlyingPackType(D) != nullptr;
 }
 
 } // namespace clangd