[InlineCost] Ignore default branch

Author: dianqk

llvm/lib/Analysis/InlineCost.cpp

@@ -701,8 +701,8 @@ class InlineCostCallAnalyzer final : public CallAnalyzer {
 
   void onFinalizeSwitch(unsigned JumpTableSize, unsigned NumCaseCluster,
                         bool DefaultDestUndefined) override {
-    if (!DefaultDestUndefined)
-      addCost(2 * InstrCost);
+    // if (!DefaultDestUndefined)
+    //   addCost(2 * InstrCost);
     // If suitable for a jump table, consider the cost for the table size and
     // branch to destination.
     // Maximum valid cost increased in this function.
@@ -1235,9 +1235,9 @@ class InlineCostFeaturesAnalyzer final : public CallAnalyzer {
 
   void onFinalizeSwitch(unsigned JumpTableSize, unsigned NumCaseCluster,
                         bool DefaultDestUndefined) override {
-    if (!DefaultDestUndefined)
-      increment(InlineCostFeatureIndex::switch_default_dest_penalty,
-                SwitchDefaultDestCostMultiplier * InstrCost);
+    // if (!DefaultDestUndefined)
+    //   increment(InlineCostFeatureIndex::switch_default_dest_penalty,
+    //             SwitchDefaultDestCostMultiplier * InstrCost);
 
     if (JumpTableSize) {
       int64_t JTCost = static_cast<int64_t>(JumpTableSize) * InstrCost +