[clang] [flang] [llvm] [IR] Convert from nocapture to captures(none) (PR #123181)

[via llvm-commits]

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@@ -1986,6 +1986,12 @@ static void decodeLLVMAttributesForBitcode(AttrBuilder &B,
       B.addMemoryAttr(ME);
   }
 
+  // Upgrade nocapture to captures(none).
+  if (Attrs & (1ULL << 21)) {
+    Attrs &= ~(1ULL << 21);
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goldsteinn wrote:

Maybe also mention that 1 << 21 is `NoCapture` here.

https://github.com/llvm/llvm-project/pull/123181