Fix #110001 build error.

Author: TIFitis

llvm/include/llvm/Frontend/OpenMP/OMPIRBuilder.h

@@ -2916,7 +2916,7 @@ class OpenMPIRBuilder {
       function_ref<MapInfosTy &(InsertPointTy CodeGenIP, llvm::Value *PtrPHI,
                                 llvm::Value *BeginArg)>
           PrivAndGenMapInfoCB,
-      llvm::Type *ElemTy, StringRef FuncName = {},
+      llvm::Type *ElemTy, StringRef FuncName,
       function_ref<bool(unsigned int, Function **)> CustomMapperCB = nullptr);
 
   /// Generator for '#omp target data'

llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp

@@ -7810,8 +7810,6 @@ Function *OpenMPIRBuilder::emitUserDefinedMapper(
 
   SmallString<64> TyStr;
   raw_svector_ostream Out(TyStr);
-  if (FuncName == "")
-    FuncName = StringRef{createPlatformSpecificName({"omp_mapper"})};
   Function *MapperFn =
       Function::Create(FnTy, GlobalValue::InternalLinkage, FuncName, M);
   MapperFn->addFnAttr(Attribute::NoInline);