Fix Threshold overwrite bug in the Oz inlining model features.

llvm/lib/Analysis/InlineCost.cpp

InlineResult finalizeAnalysis() override {
     set(InlineCostFeatureIndex::SimplifiedInstructions,
         NumInstructionsSimplified);
     set(InlineCostFeatureIndex::ConstantArgs, NumConstantArgs);
     set(InlineCostFeatureIndex::ConstantOffsetPtrArgs,
         NumConstantOffsetPtrArgs);
     set(InlineCostFeatureIndex::SROASavings, SROACostSavingOpportunities);
 
     if (NumVectorInstructions <= NumInstructions / 10)
-      increment(InlineCostFeatureIndex::Threshold, -1 * VectorBonus);
+      Threshold -= VectorBonus;
     else if (NumVectorInstructions <= NumInstructions / 2)
-      increment(InlineCostFeatureIndex::Threshold, -1 * (VectorBonus / 2));
+      Threshold -= VectorBonus / 2;
 
     set(InlineCostFeatureIndex::Threshold, Threshold);
 
     return InlineResult::success();
   }
 
   bool shouldStop() override { return false; }