[llvm] [SPIR-V] Fix truncated LinkageAttributes OpDecorate for numeric-named functions (PR #207332)

[Juan Manuel Martinez Caamaño via llvm-commits]

https://github.com/jmmartinez commented:

I forgot, try to add a short description to the PR, since this may not be an obvious issue.

https://github.com/llvm/llvm-project/pull/207332