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

[Nick Desaulniers via llvm-commits]

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@@ -5879,7 +5878,19 @@ void TargetLowering::ComputeConstraintToUse(AsmOperandInfo &OpInfo,
     OpInfo.ConstraintCode = OpInfo.Codes[0];
     OpInfo.ConstraintType = getConstraintType(OpInfo.ConstraintCode);
   } else {
-    ChooseConstraint(OpInfo, *this, Op, DAG);
+    ConstraintGroup G = getConstraintPreferences(OpInfo);
+    if (G.empty())
+      return;
+
+    unsigned BestIdx = 0;
+    while (!lowerImmediateIfPossible(G[BestIdx], Op, DAG, *this)) {
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nickdesaulniers wrote:

https://github.com/llvm/llvm-project/pull/67057/commits/a0cb4cb60f3ee83876929a152ed0a11abe34fe6c

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