Remove a bunch of empty, dead, and no-op methods from all of these

interfaces. These methods were used in the old inline cost system where
there was a persistent cache that had to be updated, invalidated, and
cleared. We're now doing more direct computations that don't require
this intricate dance. Even if we resume some level of caching, it would
almost certainly have a simpler and more narrow interface than this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153813 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/IPO/InlineSimple.cpp

@@ -42,16 +42,7 @@ namespace {
     InlineCost getInlineCost(CallSite CS) {
       return CA.getInlineCost(CS, getInlineThreshold(CS));
     }
-    void resetCachedCostInfo(Function *Caller) {
-      CA.resetCachedCostInfo(Caller);
-    }
-    void growCachedCostInfo(Function* Caller, Function* Callee) {
-      CA.growCachedCostInfo(Caller, Callee);
-    }
     virtual bool doInitialization(CallGraph &CG);
-    void releaseMemory() {
-      CA.clear();
-    }
   };
 }