add the ExportDecl matcher to Registry.cpp as well (clang-query)

[HerrCai0907]

          > > Please add the matcher to https://github.com/llvm/llvm-project/blob/main/clang/lib/ASTMatchers/Dynamic/Registry.cpp as well (clang-query).

i will do it separately to avoid this pr become bigger.

I think you only have to add it into that file for it to work, and IMO a single PR for this change would be better. But as long as it gets added, I'm fine with it

Originally posted by @5chmidti in #117901 (comment)

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Congcong Cai (HerrCai0907)

> > Please add the matcher to https://github.com/llvm/llvm-project/blob/main/clang/lib/ASTMatchers/Dynamic/Registry.cpp as well (clang-query). > > i will do it separately to avoid this pr become bigger.

I think you only have to add it into that file for it to work, and IMO a single PR for this change would be better. But as long as it gets added, I'm fine with it

Originally posted by @5chmidti in #117901 (comment)