[clang] [clang][SPIR-V] Fix OpenCL addrspace mapping when using non-zero default AS (PR #137187)

[Wu Yingcong via cfe-commits]

yingcong-wu wrote:

Hi @sarnex , I just want to let you know that this change is important to us, and want to express our gratitude to you in the previous comment. 

https://github.com/llvm/llvm-project/pull/137187