[llvm] [AMDGPU] Add a new function `getIntegerPairAttribute` (PR #133271)

[Matt Arsenault via llvm-commits]

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@@ -1398,16 +1398,25 @@ getIntegerPairAttribute(const Function &F, StringRef Name,
 SmallVector<unsigned> getIntegerVecAttribute(const Function &F, StringRef Name,
                                              unsigned Size,
                                              unsigned DefaultVal) {
+  std::optional<SmallVector<unsigned>> R =
+      getIntegerVecAttribute(F, Name, Size);
+  return R.has_value() ? *R : SmallVector<unsigned>(Size, DefaultVal);
+}
+
+std::optional<SmallVector<unsigned>>
+getIntegerVecAttribute(const Function &F, StringRef Name, unsigned Size) {
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arsenm wrote:

Title doesn't match content, we already have getIntegerPairAttribute 

https://github.com/llvm/llvm-project/pull/133271