[clang] [AST] Fix printing of large 64-bit unsigned template arguments (PR #129235)

[via cfe-commits]

devajithvs wrote:

This will help in removing one of the downstream patches in ROOT: https://github.com/root-project/root/commit/8dff24d0b687e3b2781e00697d32983a9d4d7b52

cc: @vgvassilev 

https://github.com/llvm/llvm-project/pull/129235