[llvm] [NFC] Reduce copies created of ConstantRange when getting ConstantRangeAttributes. (PR #90335)

[Nikita Popov via llvm-commits]

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@@ -265,7 +265,7 @@ class Attribute {
   FPClassTest getNoFPClass() const;
 
   /// Returns the value of the range attribute.
-  ConstantRange getRange() const;
+  const ConstantRange &getRange() const;
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nikic wrote:

These changes definitely make sense.

https://github.com/llvm/llvm-project/pull/90335