[llvm] [TabeGen] Add `PreferSmallerInstructions` for Targets. (PR #83587)

[Alfie Richards via llvm-commits]

================
@@ -661,6 +673,11 @@ struct MatchableInfo {
     if (AsmVariantID != RHS.AsmVariantID)
       return false;
 
+    // Sort by the resultant instuctions size, eg. for ARM instructions
----------------
AlfieRichardsArm wrote:

Done

https://github.com/llvm/llvm-project/pull/83587