[clang] [llvm] [BPF] Add load-acquire and store-release instructions under -mcpu=v5 (PR #108636)

[via cfe-commits]

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@@ -69,29 +69,25 @@ void BPFSubtarget::initSubtargetFeatures(StringRef CPU, 
StringRef FS) {
     CPU = "v3";
   if (CPU == "probe")
     CPU = sys::detail::getHostCPUNameForBPF();
-  if (CPU == "generic" || CPU == "v1")
+  if (CPU.empty() || CPU == "generic" || CPU == "v1")
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eddyz87 wrote:

Nitpick: `CPU` can't be empty at this point.

https://github.com/llvm/llvm-project/pull/108636
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