[llvm] [SPIR-V] Add definitions and fix implementation for atomic builtins (PR #106107)

[Michal Paszkowski via llvm-commits]

================
@@ -0,0 +1,16 @@
+; RUN: llc -O0 -mtriple=spirv64-unknown-unknown %s -o - | FileCheck %s
----------------
michalpaszkowski wrote:

Yes, forgot about this, thanks for reminding! 

https://github.com/llvm/llvm-project/pull/106107