[BOLT][NFCI] Move ProbeDecoder to PseudoProbeRewriter

[maksfb]

Summary

ProbeDecoder is used only by PseudoProbeRewriter. Move it out of the
BinaryContext.

Depends on D154022

[maksfb]

Rebase.

[maksfb]

Rebase.

[Amir]

Accepting but could be folded into the previous diff?

[maksfb]

Sounds good. This diff used to be larger, but then parts of it got merged into the previous one. At this point it's easier just to merge the two.

[maksfb]

Committed in D154022.

bolt/include/bolt/Core/BinaryContext.h

 #include "llvm/ADT/iterator.h"
 #include "llvm/BinaryFormat/Dwarf.h"
 #include "llvm/BinaryFormat/MachO.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCCodeEmitter.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCObjectFileInfo.h"
 #include "llvm/MC/MCObjectWriter.h"
-#include "llvm/MC/MCPseudoProbe.h"
 #include "llvm/MC/MCSectionELF.h"
 #include "llvm/MC/MCSectionMachO.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/MC/TargetRegistry.h"
 #include "llvm/Support/ErrorOr.h"
 #include "llvm/Support/RWMutex.h"
 #include "llvm/Support/raw_ostream.h"
public:
   /// Map linux kernel program locations/instructions to their pointers in
   /// special linux kernel sections
   std::unordered_map<uint64_t, std::vector<LKInstructionMarkerInfo>> LKMarkers;
 
   /// List of external addresses in the code that are not a function start
   /// and are referenced from BinaryFunction.
   std::list<std::pair<BinaryFunction *, uint64_t>> InterproceduralReferences;
 
-  /// PseudoProbe decoder
-  MCPseudoProbeDecoder ProbeDecoder;
-
   /// DWARF encoding. Available encoding types defined in BinaryFormat/Dwarf.h
   /// enum Constants, e.g. DW_EH_PE_omit.
   unsigned LSDAEncoding = dwarf::DW_EH_PE_omit;
 
   BinaryContext(std::unique_ptr<MCContext> Ctx,
                 std::unique_ptr<DWARFContext> DwCtx,
                 std::unique_ptr<Triple> TheTriple, const Target *TheTarget,
                 std::string TripleName, std::unique_ptr<MCCodeEmitter> MCE,