[llvm] [TargetLowering] Deduplicate choosing InlineAsm constraint between ISels (PR #67057)

[Nick Desaulniers via llvm-commits]

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@@ -4820,6 +4820,15 @@ class TargetLowering : public TargetLoweringBase {
   /// Given a constraint, return the type of constraint it is for this target.
   virtual ConstraintType getConstraintType(StringRef Constraint) const;
 
+  using ConstraintPair = std::pair<StringRef, TargetLowering::ConstraintType>;
+  using ConstraintGroup = SmallVector<ConstraintPair>;
+  /// Given an OpInfo with list of constraints codes as strings, return a
+  /// sorted Vector of pairs of constraint codes and their types in priority of
+  /// what we'd prefer to lower them as. This may contains immediates that
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nickdesaulniers wrote:

https://github.com/llvm/llvm-project/pull/67057/commits/2d16f27727b10937e76a715c9142a5d7e68f5173

https://github.com/llvm/llvm-project/pull/67057