Error when using the command below to compile clangd.

```

mkdir build

cd build

cmake -G "Unix Makefiles" ../llvm -DLLVM_ENABLE_PROJECTS="clang;mlir;clang-tools-extra" -DLLVM_BUILD_EXAMPLES=ON -DCMAKE_BUILD_TYPE=Debug -DMLIR_INCLUDE_INTEGRATION_TESTS=ON

cmake --build . --target clangd

```

Error message :


```

llvm-project/clang-tools-extra/clangd/XRefs.cpp::2051

CXXRD = CTSD->getTemplateInstantiationPattern();

llvm-project/clang-tools-extra/clangd/refactor/Rename.cpp::124

FieldParent = FieldParent->getTemplateInstantiationPattern();

```

Mainly because we have changed the return value of 'getTemplateInstantiationPattern()' from 'CXXRecordDecl' to 'RecordDecl'.

We can simply solve this by casting 'RecordDecl' to 'CXXRecordDecl', it will be fine in C++.

However, the casting result will be null in BSC, cause the instantiation of BSC template-struct is 'RecordDecl', not 'CXXRecordDecl' (But it won`t report error when compiling clang or clangd.).