[clang] [Clang][AMDGPU] Add builtins for instrinsic `llvm.amdgcn.raw.ptr.buffer.load` (PR #99258)

[Shilei Tian via cfe-commits]

================
@@ -155,6 +155,12 @@ BUILTIN(__builtin_amdgcn_raw_buffer_store_b32, "viQbiiIi", "n")
 BUILTIN(__builtin_amdgcn_raw_buffer_store_b64, "vV2iQbiiIi", "n")
 BUILTIN(__builtin_amdgcn_raw_buffer_store_b96, "vV3iQbiiIi", "n")
 BUILTIN(__builtin_amdgcn_raw_buffer_store_b128, "vV4iQbiiIi", "n")
+BUILTIN(__builtin_amdgcn_raw_buffer_load_b8, "cQbiiIi", "n")
+BUILTIN(__builtin_amdgcn_raw_buffer_load_b16, "sQbiiIi", "n")
+BUILTIN(__builtin_amdgcn_raw_buffer_load_b32, "iQbiiIi", "n")
+BUILTIN(__builtin_amdgcn_raw_buffer_load_b64, "V2iQbiiIi", "n")
+BUILTIN(__builtin_amdgcn_raw_buffer_load_b96, "V3iQbiiIi", "n")
----------------
shiltian wrote:

We can do a separate patch to add the sub target feature to change both of them.

https://github.com/llvm/llvm-project/pull/99258