Revert "blockfreq: Rewrite BlockFrequencyInfoImpl" (brson#2)

This reverts commit r206622 and the MSVC fixup in r206626.

Apparently the remotely failing tests are still failing, despite my
attempt to fix the nondeterminism in r206621.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206628 91177308-0d34-0410-b5e6-96231b3b80d8

Author: dexonsmith

include/llvm/Analysis/BlockFrequencyInfoImpl.h

@@ -11,7 +11,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE "block-freq"
 #include "llvm/Analysis/BlockFrequencyInfo.h"
 #include "llvm/Analysis/BlockFrequencyInfoImpl.h"
 #include "llvm/Analysis/BranchProbabilityInfo.h"
@@ -107,7 +106,6 @@ struct DOTGraphTraits<BlockFrequencyInfo*> : public DefaultDOTGraphTraits {
 INITIALIZE_PASS_BEGIN(BlockFrequencyInfo, "block-freq",
                       "Block Frequency Analysis", true, true)
 INITIALIZE_PASS_DEPENDENCY(BranchProbabilityInfo)
-INITIALIZE_PASS_DEPENDENCY(LoopInfo)
 INITIALIZE_PASS_END(BlockFrequencyInfo, "block-freq",
                     "Block Frequency Analysis", true, true)
 
@@ -122,16 +120,14 @@ BlockFrequencyInfo::~BlockFrequencyInfo() {}
 
 void BlockFrequencyInfo::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.addRequired<BranchProbabilityInfo>();
-  AU.addRequired<LoopInfo>();
   AU.setPreservesAll();
 }
 
 bool BlockFrequencyInfo::runOnFunction(Function &F) {
   BranchProbabilityInfo &BPI = getAnalysis<BranchProbabilityInfo>();
-  LoopInfo &LI = getAnalysis<LoopInfo>();
   if (!BFI)
     BFI.reset(new ImplType);
-  BFI->doFunction(&F, &BPI, &LI);
+  BFI->doFunction(&F, &BPI);
 #ifndef NDEBUG
   if (ViewBlockFreqPropagationDAG != GVDT_None)
     view();
@@ -162,7 +158,7 @@ void BlockFrequencyInfo::view() const {
 }
 
 const Function *BlockFrequencyInfo::getFunction() const {
-  return BFI ? BFI->getFunction() : nullptr;
+  return BFI ? BFI->Fn : nullptr;
 }
 
 raw_ostream &BlockFrequencyInfo::