Add a method to ScalarEvolution for telling it when a loop has been

modified in a way that may effect the trip count calculation. Change
IndVars to use this method when it rewrites pointer or floating-point
induction variables instead of using a doInitialization method to
sneak these changes in before ScalarEvolution has a chance to see
the loop. This eliminates the need for LoopPass to depend on
ScalarEvolution.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64810 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/LoopPass.cpp

@@ -14,7 +14,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Analysis/LoopPass.h"
-#include "llvm/Analysis/ScalarEvolution.h"
 using namespace llvm;
 
 //===----------------------------------------------------------------------===//
@@ -173,8 +172,6 @@ void LPPassManager::getAnalysisUsage(AnalysisUsage &Info) const {
   // LPPassManager needs LoopInfo. In the long term LoopInfo class will 
   // become part of LPPassManager.
   Info.addRequired<LoopInfo>();
-  // Used by IndVar doInitialization.
-  Info.addRequired<ScalarEvolution>();
   Info.setPreservesAll();
 }