[clang] [llvm] Reapply "[CGObjC] Allow clang.arc.attachedcall on -O0 (#164875)" (PR #177285)

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@@ -2429,11 +2427,8 @@ static llvm::Value *emitOptimizedARCReturnCall(llvm::Value *value,
 
   llvm::Triple::ArchType Arch = CGF.CGM.getTriple().getArch();
 
-  // FIXME: Do this on all targets and at -O0 too. This can be enabled only if
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AZero13 wrote:

Okay addressed!

https://github.com/llvm/llvm-project/pull/177285