[clang] [HLSL][SPIR-V] Add hlsl_private address space for HLSL/SPIR-V (PR #122103)

[Nathan Gauër via cfe-commits]

================
@@ -58,6 +58,7 @@ enum class LangAS : unsigned {
 
   // HLSL specific address spaces.
   hlsl_groupshared,
+  hlsl_private,
----------------
Keenuts wrote:

Hi again! It's been a while, but this now went through an HLSL proposal.
https://github.com/llvm/wg-hlsl/commit/4c9e11aa50727c53b10d232195fb88fd5376f19c

https://github.com/llvm/llvm-project/pull/122103