[clang] [llvm] [SPIRV][RFC] Rework / extend support for memory scopes (PR #106429)

[Matt Arsenault via cfe-commits]

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@@ -766,8 +766,17 @@ static void EmitAtomicOp(CodeGenFunction &CGF, AtomicExpr 
*Expr, Address Dest,
   // LLVM atomic instructions always have synch scope. If clang atomic
   // expression has no scope operand, use default LLVM synch scope.
   if (!ScopeModel) {
+    llvm::SyncScope::ID SS = CGF.getLLVMContext().getOrInsertSyncScopeID("");
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arsenm wrote:

Don't query this just to reassign it? 

https://github.com/llvm/llvm-project/pull/106429
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