Changed sign of LastCallToStaticBouns

Summary:
I think it is much better this way.
When I firstly saw line:
  Cost += InlineConstants::LastCallToStaticBonus;
I though that this is a bug, because everywhere where the cost is being reduced
it is usuing -=.

Reviewers: eraman, tejohnson, mehdi_amini

Subscribers: llvm-commits, mehdi_amini

Differential Revision: https://reviews.llvm.org/D23222

llvm-svn: 278290

llvm/include/llvm/Analysis/InlineCost.h

@@ -42,7 +42,7 @@ const int OptAggressiveThreshold = 275;
 const int InstrCost = 5;
 const int IndirectCallThreshold = 100;
 const int CallPenalty = 25;
-const int LastCallToStaticBonus = -15000;
+const int LastCallToStaticBonus = 15000;
 const int ColdccPenalty = 2000;
 const int NoreturnPenalty = 10000;
 /// Do not inline functions which allocate this many bytes on the stack

llvm/lib/Analysis/InlineCost.cpp

@@ -1257,7 +1257,7 @@ bool CallAnalyzer::analyzeCall(CallSite CS) {
   bool OnlyOneCallAndLocalLinkage =
       F.hasLocalLinkage() && F.hasOneUse() && &F == CS.getCalledFunction();
   if (OnlyOneCallAndLocalLinkage)
-    Cost += InlineConstants::LastCallToStaticBonus;
+    Cost -= InlineConstants::LastCallToStaticBonus;
 
   // If this function uses the coldcc calling convention, prefer not to inline
   // it.

llvm/lib/Transforms/IPO/Inliner.cpp

@@ -312,7 +312,7 @@ shouldBeDeferred(Function *Caller, CallSite CS, InlineCost IC,
   // be removed entirely.  We did not account for this above unless there
   // is only one caller of Caller.
   if (callerWillBeRemoved && !Caller->use_empty())
-    TotalSecondaryCost += InlineConstants::LastCallToStaticBonus;
+    TotalSecondaryCost -= InlineConstants::LastCallToStaticBonus;
 
   if (inliningPreventsSomeOuterInline && TotalSecondaryCost < IC.getCost())
     return true;